# Conference on Neutrino and Nuclear Physics (CNNP2020) Arabella Hotel and Spa, South Africa, 24-28 February 2020

Africa/Johannesburg
Description

The international Conference on Neutrino and Nuclear Physics 2020 (CNNP2020) will be held at the Arabella Hotel and Spa in the Kogelberg Biosphere near Cape Town (South Africa) from 24-28 February 2020 and will be hosted by iThemba LABS. The Kogelberg Biosphere is internationally famed for its natural beauty and biodiversity, and is within an hour's drive from Cape Town.

The main objective of the Conference on Neutrino and Nuclear Physics is to promote collaboration between scientists from the fields of nuclear, neutrino, astro and dark-matter physics, and to create an environment where experiments and theories in which nuclear physics aspects are particularly relevant can be discussed.

A preliminary list of the topics to be discussed during the conference include:

•     Nuclear double beta decays
•     Nuclear structure in connection with neutrino physics
•     Nuclear reactions as probes for weak decays
•     Neutrino-nucleus interaction at low and high energies
•     Supernova models and detection of supernova neutrinos
•     Solar models and detection of solar neutrinos
•     Direct and indirect dark-matter searches
•     Rare beta decays of nuclei for measurements of neutrino-mass
•     Neutrino oscillations and matter effects
•     Anomalies in reactor neutrinos
•     New detection technologies related to the field

The very successful inaugural CNNP2017 conference was held in Catania in October 2017. CNNP2020 will be the second conference in the series and aims to build upon the foundation of CNNP2017 to bring together people working at the intersections of different fields to exchange ideas and results.

Registration
CNNP2020 Registration Form
CNNP Accompanying Persons Registration form
Participants
• Aldo Serenelli
• Alejandro Algora
• Alejandro Sonzogni
• Alessandro Minotti
• Alessio Caminata
• Alina Vishneva
• Andrea Giuliani
• Andrea Longhin
• Andrey Sheshukov
• Andy Buffler
• ANIL KUMAR
• Carlo Gustavino
• Christian Weinheimer
• Clarence Virtue
• Clementina Agodi
• David Hervas
• ELENA APRILE
• Eligio Lisi
• Ernesto Kemp
• Fabio Iacob
• Faiҫal Azaiez
• Federico Nova
• Fedor Simkovic
• Francesca Gulminelli
• Giorgio Gratta
• Giovanni Benato
• Hawraa Khalife
• Helena Almazan
• Hyunsu Lee
• Izyan Hazwani Binti Hashim
• Jacques Pienaar
• Javier Menendez
• Jesus Lubian Rios
• Joel Kostensalo
• Jouni Suhonen
• Jörn Kleemann
• Kai Zuber
• Karlheinz Langanke
• Karol Lang
• Klaus Blaum
• Leendert Hayen
• Lindsay Donaldson
• Lotta Jokiniemi
• Luciano Pandola
• Manfred Lindner
• Marcello Campajola
• Mathieu Liatoud
• Mathis Wiedeking
• Michael Nii Sanka Ansah
• Mohamed Ismaiel
• Patricia Sanchez-Lucas
• Peter von Neumann-Cosel
• Remco Zegers
• Retief Neveling
• Ricky Smit
• Sabin Stoica
• Samuel Hedges
• Shaofei Zhu
• Smarajit Triambak
• Takaharu Otsuka
• Tommi Eronen
• Toshio Suzuki
• Ushak Rahaman
• Vincenzo Bellini
• Waleed Hwash
• Yuichi Oyama
• Yuri Efremenko
• zeinab ranjbar
Contact
• Monday, 24 February
• 08:00 08:30
Registration 30m
• 08:30 09:00
Opening and Welcome 30m
• 09:00 10:30
Invited Talks Main Venue

#### Main Venue

• 09:00
Recent results and perspectives on beta decay, double beta decay and lepton flavour violation 30m

The lepton sector of the Standard Model is a very important and interesting field to search for new physics beyond the standard model. As we know that quarks and neutrinos are mixing it is an open question why the charged leptons are now. This stimulates the search for charge lepton violation (CLFV). In addition, neutrino-less double beta decay would violate total lepton number by 2 and prove that neutrinos are their own antiparticle. The obtained half-life can be linked to a potential Majorana neutrino mass. This is providing a complementary measurement to normal beta decay where new interesting results are obtained.
This talk will shortly review the current situation in this area of research, required support from theory and an outlook into the future.

Speaker: Prof. Kai Zuber (Technical University Dresden)
• 09:30
Nuclear processes and effective weak couplings 30m

The axial-type of weak couplings seem to be renormalized in medium-heavy and heavy nuclei as suggested by analyses of nuclear beta and double beta decays, nuclear muon capture, charge-exchange reactions and low-energy neutrino-nucleus scattering [1]. Also some calculations suggest that also the vector-type of couplings could attain effective values in nuclei [2,3]. The possible variation of the values of weak couplings as functions of the nuclear mass number affects the information deduced from the possible future measurements of the half-lives of neutrinoless double beta ($0\nu\beta\beta$) decays [4],
nuclear muon captures, electron and antineutrino spectra of medium-mass fission fragments in nuclear reactors, etc. In particular, there could be direct effects on the reactor antineutrino anomaly and the Gallium anomaly [1].

Studies of the $0\nu\beta\beta$ decays of nuclei are of paramount importance in order to learn about the basic properties of the neutrino. An appealing way to probe this decay rather directly is the nuclear muon capture, since it operates in the same momentum-exchange region as the $0\nu\beta\beta$ decays. Recent results on the muon capture rate on $^{100}$Mo [5] indicate that the muon-capture calculations are able to reproduce the measured capture strength function in a quite satisfactory way.

In my contribution I present an overview of the problem of effective weak couplings and discuss the relation of the nuclear muon capture to $0\nu\beta\beta$ processes.

REFERENCES

[1] H. Ejiri, J. Suhonen and K. Zuber, Neutrino-nuclear responses for astro-neutrinos,
single beta decays and double beta decays, Phys. Rep. 797 (2019) 1-102.
[2] J. Suhonen, Value of the axial-vector coupling strength in $\beta$ and $\beta\beta$ decays: A review, Front. Phys. 5 (2017) 55.
[3] J. Suhonen and J. Kostensalo, Double $\beta$ decay and the axial strength, Front. Phys. 7 (2019) 29.
[4] J. Suhonen, Impact of the quenching of $g_{\rm A}$ on the sensitivity of
$0\nu\beta\beta$ experiments, Phys. Rev. C 96 (2017) 055501.
[5] L. Jokiniemi, J. Suhonen, H. Ejiri and I. H. Hashim, Pinning down the strength
function for ordinary muon capture on $^{100}$Mo, Phys. Lett. B 794 (2019) 143-147.

Speaker: Prof. Jouni Suhonen (University of Jyväskylä)
• 10:00
Roles of Neutrinos in Explosive Nucleosynthesis of Supernovae and Neutron-Star Mergers and Cosmic Evolution 30m

The big-bang universe, supernovae (SNe), collapsars and binary neutron-star mergers (NSMs) are the viable celestial sources of “multi-messengers”. These messengers are neutrinos for weak force, gravitational waves for gravity, photons for electromagnetism, and atomic nuclei for strong nuclear force [1]. Their detection takes the keys to solve still unanswered questions such as mass hierarchy of neutrinos [2], overproduction of big-bang lithium [3], the origin of p-nuclei [4], and the origin of r-process elements [1,5]. We will discuss the roles of neutrinos and radioactive nuclei for solving these problems.
Still unknown neutrino mass and oscillations are particularly important to answer the fundamental question why we need to go beyond the standard theory of elementary particles and fields. We will, first, discuss cosmological background neutrinos and fluctuations of primordial magnetic fields in order to solve overproduction problem of primordial big-bang lithium [3]. The relic SN neutrinos also are the energetic component of cosmic background neutrinos. We will propose a method how to constrain the neutrino mass hierarchy and EOS of proto-neutron stars in the proposed HK project of detecting these energetic neutrinos [6].
A huge flux of neutrinos is emitted from proto-neutron stars or accretion disks formed in SNe, collapsars and binary NSMs. The collective flavor oscillation due to the neutrino self-interactions is presumed to occur in the deepest region inside the iron-core, while the MSW high-density resonance occurs near the bottom of He/C-layer. The light mass nuclei, 7Li and 11B, and the intermediate-to-heavy mass nuclei, 19F, 50V, 53Mn, 92Nb, 98Tc, 138La and 180Ta, are respectively produced in outer He/C-layer and inner O-Ne-Mg-layer exposed to the intense neutrino flux (-process) [2]. The intermediate mass p-nuclei, 74Se, 78Kr, 84Sr, 74Se, 92,94Mo and 96,98Ru (p-process) [4], and r-process nuclei [1] are produced in the iron-core. Therefore, nucleosynthesis of 7Li and 11B is affected by both collective and MSW effects, however all the other intermediate-to-heavy mass nuclei are affected by the collective oscillation alone, being almost free from MSW effect. We will, secondly, discuss how differently these nucleosynthetic products depend on each of collective or MSW neutrino oscillation effect, and will propose how to distinguish these two effects from each other [2].
Finally, we will discuss the origin of r-process nucleosynthesis to understand the cosmic evolutionary history of each contribution from SN, collapsar and binary NSM [5]. We here discuss the roles of GW detection and spectroscopic astronomical observation of atomic nuclei as well as nuclear experiments of radioactive nuclei [1].

Speaker: Taka Kajino (Being University/NAOJ/University of Tokyo)
• 10:30 11:00
Coffee/Tea Break 30m
• 11:00 13:00
Invited Talks Main Venue

#### Main Venue

• 11:00
New results from the CUORE experiment 30m

The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for neutrinoless double-beta decay (0νββ) that has been able to reach the one-ton scale. The detector, located at the Laboratori Nazionali del Gran Sasso in Italy, consists of an array of 988 TeO$_{2}$ crystals arranged in a compact cylindrical structure of 19 towers. The construction of the experiment was completed in August 2016 with the installation of all towers in the cryostat. CUORE achieved its first physics data run in 2017 corresponding to a TeO$_{2}$ exposure of 86.3 kg∙yr and a median statistical sensitivity to a $^{130}$Te 0νββ half-life of 7.0 × 10$^{24}$ yr. Following multiple optimization campaigns in 2018, CUORE is currently in stable operating mode and has accumulated data corresponding to a TeO$_{2}$ exposure approaching 500 kg∙yr. In this talk, we present the updated 0νββ results of CUORE, as well as review the detector performance. We finally give an update of the CUORE background model and the measurement of the $^{130}$Te two neutrino double-beta decay (2νββ) half-life.

Speaker: Dr Giovanni Benato (LNGS-INFN)
• 11:30
MAJORANA, LEGEND, and the future of the search for Neutrinoless Double-Beta Decay in Ge-76 30m

The MAJORANA collaboration is searching for neutrinoless double-beta ($0\nu\beta\beta$) decay in $^{76}$Ge using modular arrays of enriched, high-purity Ge detectors. The MAJORANA DEMONSTRATOR consists of an array of 44 kg of high-purity Ge detectors with a p-type point contact geometry currently operating in the Sanford Underground Research Facility in Lead, South Dakota. The ultra-low background and world-leading energy resolution achieved by the MAJORANA DEMONSTRATOR enable a sensitive $0\nu\beta\beta$ decay search, as well as additional searches for physics beyond the Standard Model. The Large Enriched Germanium Experiment for Neutrinoless Double-Beta Decay (LEGEND) will combine the best techniques from the DEMONSTRATOR and the Germanium Detector Array (GERDA) to reach even higher sensitivities to $0\nu\beta\beta$ decay. The LEGEND collaboration is pursuing a phased approach to a tonne-scale $^{76}$Ge experiment, with ultimate discovery potential at a half-life beyond $10^{28}$ years. The first phase, LEGEND-200, is the deployment of 200 kg of enriched $^{76}$Ge detectors in the existing GERDA cryostat at the LNGS underground lab in Italy. LEGEND-200, scheduled to start operation in 2021, will use GERDA and MAJORANA enriched detectors and newly developed inverted coax point contact detectors. The MAJORANA DEMONSTRATOR's latest results will be presented as well as the construction status of LEGEND-200, ongoing LEGEND tonne-scale R&D, and the physics outlook of the LEGEND experimental program.

Speaker: David Hervas (University of North Carolina at Chapel Hill)
• 12:00
Status of the SuperNEMO Experiment 30m

The SuperNEMO Experiment is designed to search for neutrinoless double beta decays of the Se-82 isotope. The detector employs the multi-observable tracking-and-calorimetry technique pioneered by the NEMO-3 Experiment. Electrons originating from double beta decays of an isotope in thin isotopic foils are tracked in wire tracking chambers and their energy is measured by large scintillator blocks. The topology, timing, and energy provide a powerful means of identifying and measuring the final state of decays. The technique is also very effective in rejecting backgrounds due mostly to traces of natural radioactivity in foils and detector materials. The SuperNEMO Demonstrator module is currently being commissioned at the Modane Underground Laboratory in the Frejus Tunnel. We will discuss details of the detector elements, the latest status of the experiment, and the physics reach.

Speaker: Alessandro Minotti (LAPP - IN2P3)
• 12:30
The nEXO double-beta decay experiment 30m

The search for neutrinoless double-beta decay represents one of the most exciting
opportunities to explore physics beyond the Standard Model. The knowledge that
neutrinos are massive particles, yet, with masses that are many orders of magnitude
smaller than those of charged fermions, provides encouragement to further push
the sensitivity of these experiments.

nEXO is a 5-tonne detector based on the isotope 136Xe in a single phase, liquid
time projection chamber. Its design is based on EXO-200, the first 100kg-class
experiment to take data, demonstrating the power of a monolithic detector with
good energy resolution and superior topological event reconstruction. nEXO is
expected to reach a half-life sensitivity of about 10^28 years, covering substantial
discovery space. The detector includes several state-of-the-art components but,
at the same time, offers a conservative approach in which the background estimate
is solidly grounded on existing materials and reliable simulation tools. In this talk
the nEXO design and sensitivity reach will be discussed.

Speaker: nEXO Collaboration
• 13:00 14:00
Lunch 1h
• 14:00 16:00
Contributed Talks Main Venue and Parallel Venue

#### Main Venue and Parallel Venue

• 14:00
Dark Matter searches at Belle II 20m Main Venue

#### Main Venue

The Belle II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is $8\times 10^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims to record 50 ab$^{-1}$ of data, a factor of 50 more than its predecessor. Main operation of SuperKEKB has started in March 2019, with the full detector installed; this first running period ended in July. The machine reached a peak luminosity of $1.2\times 10^{34}$ cm$^{-2}$s$^{-1}$, and Belle II recorded a data sample of about 6.5 fb$^{-1}$. Data taking will resume in October 2019. Already this early data set, with specifically designed triggers, offers the possibility to search for a large variety of dark sector particles in the GeV mass range, complementary to LHC and to dedicated low energy experiments; these searches will benefit from more data which will be accumulated in the upcoming Fall/Winter run. This talk will review the state of the dark sector searches at Belle II with a focus on the discovery potential of the early data, and show the first results

Speaker: Ida Peruzzi (Laboratori Nazionali di Frascati dell'INFN)
• 14:00
Searching for neutrinoless double beta of 100Mo: the CUPID-Mo experiment 20m Parallel Venue

#### Parallel Venue

$^{100}$Mo deployed in the form of enriched Li$_{2}$ MoO$_{4}$ crystals can be used as a promising scintillating bolometer to search for 0$\nu\beta\beta$ in a tonne-scale experiment. In this talk we will review the properties of this target crystal and achieved bolometric detector performances that make it the baseline choice for CUPID (CUORE Upgrade with Particle ID).
CUPID-Mo, installed in the underground laboratory of Modane, consists of an array of 20 enriched ~0.2 kg Li2MoO4 crystals equipped with 20 cryogenic Ge bolometers to discriminate alpha from beta/gamma events by the detection of both heat and scintillation light signals. The commissioning has started in december 2018 and we have switched to routine data taking in spring 2019. In this talk, we will present results confirming an excellent bolometric performance of $\sim$5-6 keV energy resolution (FWHM) at 2615 keV, full alpha to beta gamma separation and improved estimates on the radiopurity of the crystals. We will also report on the background level observed in the region of interest and give a competitive limit on the neutrinoless double-beta decay half-life of Mo-100 as well the most precise measurement of the 2-neutrino decay mode. We will conclude with an expectation of the sensitivity of CUPID-Mo and prospects for CUPID.

Speaker: Claudia Nones
• 14:20
CUPID-0: a double-readout cryogenic detector for DBD 20m

A convincing observation of neutrino-less double beta decay (0𝜈DBD) relies on the possibility of operating high-energy resolution detectors in background-free conditions.
Scintillating cryogenic calorimeters are one of the most promising tools to fulfill the requirements for a next-generation experiment. Several steps have been taken to demonstrate the maturity of this technique, starting form the successful experience of CUPID-0.
The CUPID-0 experiment demonstrated the complete rejection of the dominant alpha background measuring the lowest counting rate in the region of interest for this technique. Furthermore, the most stringent limit on the Se-82 0𝜈DBD was established running 26 ZnSe crystals during two years of continuous detector operation.
In this contribution we present the final results of CUPID-0 Phase I including a detailed model of the background, the measurement of the 2𝜈DBD half-life and the evidence that this nuclear transition is single state dominated. The first results obtained after the upgrade of the detector in 2019 are presented as well.

Speaker: Dr Lorenzo Pagnanini
• 14:20
EDELWEISS: searching for low-mass dark matter particles with germanium low-temperature detectors 20m Main Venue

#### Main Venue

EDELWEISS is a direct dark matter search experiment aiming at the detection of WIMPS and other candidates as the composition of the galactic dark matter halo. The EDELWEISS detection method is based on arrays of germanium mono-crystals operated at temperatures around or below 20 mK. Energy deposited in the crystals by particle interactions are read out simultaneously by thermal sensors, which collect the phonon component of the signal, and by surface electrodes, which collect the ionization component. This hybrid detection method is extremely powerful for background reduction. The EDELWEISS devices are operated in a low-radioactivity heavily-shielded dilution refrigerator installed in the deepest European underground laboratory in Modane (France). Recently, results have been achieved also with an extremely low-noise set up installed above ground.
The versatile and highly performing technology adopted by EDELWEISS opens new possibilities to detect signals induced by either electrons or nuclear recoils. EDELWEISS has developed a rich program to look for DM candidates with masses below 1 GeV and down to the MeV range (EDELWEISS SubGeV program), in a region of the parameter space where low-temperature detectors are extremely competitive. There is an increasing interest in this mass range motivated by the lack of evidence of new physics at LHC (e.g. SUSY), which pushes to look beyond the standard WIMP dark matter scenario
Detectors are operated in two modes, according to the voltage magnitude applied to the ionization electrodes. In the low-voltage mode, discrimination between nuclear and electron recoils is maintained, with threshold down to 50 eV (electron equivalent) in prospects. In the high-voltage mode, detection of single electron-hole pair in massive detectors is possible.
We will report both on the promising technological advancements in these detection regimes and on recent results about low-mass candidates. In particular, we will present results on Axion-Like Particles in the keV range and will report the attainment of the first sub-GeV spin-independent dark matter limit based on a germanium target. The search has been extended to Strongly Interacting Particles (SIMP) down to masses of 45 MeV by exploiting the Migdal effect. Results on SIMPs with spin-dependent interactions will also be presented.

Speaker: Andrea Giuliani (CNRS/CSNSM)
• 14:40
DELight – Searching for light dark matter using superfluid helium 20m Main Venue

#### Main Venue

The Direct search Experiment for Light Dark Matter (DELight) aims to develop a novel detector technology for the search for light dark matter based on the properties of the superfluid phase of the inert gas 4He. This detector uses the purest material imaginable, provides multiple independent signals for background suppression, has the potential to exploit directionality for event identification, and offers the ability to extend the sensitivity of direct dark matter search to the MeV range. In the first phase, we will build a 10-liter prototype detector with metallic magnetic calorimeters (MMCs) as photon and phonon sensors to investigate the signal threshold that can be reliably detected and to study the directional dependence of the quantum evaporation of He atoms on the energy and mass of the scattering particle. Here we will discuss the physics and the potential of such a detector for light dark matter as well as the goals and long-term perspective of DELight.

Speaker: Christian Enss (Kirchhoff Institute for Physics, Heidelberg University)
• 14:40
JUNO (Jiangmen Underground Neutrino Observatory), its design and status 20m

Jiangmen Underground Neutrino Observatory (JUNO), a next generation underground reactor antineutrino experiment, is proposed to determine the
neutrino mass hierarchy and precisely measure neutrino oscillation parameters using a massive liquid scintillator detector underground. The experimental
hall, spanning more than 50 meters, is under a granite mountain of over 700 m overburden. The central antineutrino detector, built with 35.4-meter
diameter acrylic sphere, contains 20 kilotons of liquid scintillator and ~18,000 20 inch PMTs (and ~25,000 3 inch PMTs). The antineutrino detector is placed
in a water pool shielding system which also functions as an active water Cherenkov veto detector. On the top of water pool is a Top Tracker system which
further improves the muon track reconstruction. The talk will present the project design and status.

Speaker: Dr Xiaonan Li (Institute of High Energy Physics, Chinese Academy of Sciences)
• 15:00
Characterization of first prototypes of thin targets for the NUMEN Experiment 20m Parallel Venue

#### Parallel Venue

The NUMEN Experiment, at INFN-LNS (Catania), aims to get information on the Nuclear Matrix Elements of the Neutrinoless Double Beta Decay, by measuring Double Charge Exchange (DCE) reactions cross-sections [1]. The energy of the reaction products must be measured with high resolution. To fulfil this requirement, the target must be thin to minimize dispersion and straggling effects on the ejectile energy; the energy resolution is also influenced by the target thickness uniformity. Due to the small thickness, a mechanical support is necessary for the target. On the other hand, to have a large statistics very intense ion beams are required, which release a large amount of heat inside the target. Therefore the isotope will be deposited on a Highly Oriented Pyrolytic Graphite (HOPG) substrate that quickly transfers the heat outside the target system, thanks to its high surface thermal conductivity [2]. The target thickness will be of a few hundreds of nanometer, while the HOPG will be around 2 micrometers thick [3].
Prototypes of Germanium and Tellurium targets have been deposited with Electron Beam Evaporation process, which parameters have been optimized.
In the NUMEN Experiment the reaction final nuclei can be produced in different final states; a good energy resolution is needed to distinguish between the ground state and the first excited states to deduce the related DCE cross-sections. Unfortunately, the deposition technique does not guarantee a perfectly uniform target thickness. Such surface non-uniformity can be qualitatively inspected by Field Emission Scanning Microscopy (FESEM): images of the best Tellurium and Germanium target prototypes will be presented in the talk.
In order to evaluate both thickness and uniformity of the targets, alpha transmission spectroscopy measurements have been performed. The energy distribution shows a peak, which corresponds to the most frequent thickness; the width is related to the thickness spread. An experimental set-up has been designed, using an 241Am alpha-source and a silicon detector to measure the energy of the transmitted alpha particles. Some tests have been made with Rutherford Backscattering (RBS) technique on the same target samples, to evaluate the systematic error of the alpha-measurements.
In order to evaluate the dispersion and straggling effects due to the thickness and non-uniformity on the resolution of the measurements of the DCE products energy, a Montecarlo code has been implemented. The measured parameters of the thickness distribution have been inserted as input data of the simulation, for different values of the relative branching fractions of ground, first and second excited states. The obtained spectra give information about the resolution between two levels. The results are promising and will be shown in the talk.
[1] Cappuzzello F. et al., Eur. Phys. J. A, 54 (2018) 72, https://doi.org/10.1140/epja/i2018-12509-3
[2] V. Capirossi et al., Nucl. Instr, and Meth. in Phys. Res. A, (2018). https://doi.org/10.1016/j.nima.2018.08.081
[3] F. Pinna et al., Design and test of an innovative static thin target for intense ion beams, Il Nuovo Cimento (2019), in press.

Speaker: Vittoria Capirossi (Polytechnic of Turin - INFN Turin)
• 15:00
Q-value measurements of rare weak beta decays with JYFLTRAP 20m Main Venue

#### Main Venue

Rare weak beta decays can be potentially used in searches for the neutrino mass. These are, e.g., decays between nuclear ground states and excited states in daughter nuclei that have very small (< 1 keV) decay energy ($Q$-value). The beta decay of $^{115}$In $9/2^+$ ground state to $3/2^+$ state in $^{115}$Sn currently has the smallest measured $Q$-value (0.155(24) keV [1,2]) of any beta decay.

There are several more nuclei that potentially possess similarly low $Q$-values [3]. Those are optimal for experimental neutrino mass determination through distortions in the beta endpoint spectrum. First, before any attempt to measure the endpoint spectrum, it is necessary to confirm whether the $Q$-value of the decay is positive. The ground-state-to-ground state $Q$-value can be measured with mass spectrometry while the excitation energy of the excited state in the daughter can be deduced from gamma-ray spectroscopy.
Using the JYFLTRAP Penning trap setup [4,5] at the Accelerator Laboratory of the University of Jyväskylä, we have measured $Q$-values of several such cases. One of those is the $^{135}$Cs decay to $^{135}$Ba, which was measured with a precision at the 100-eV level. Along with this Q-value measurement I’ll give an overview of the used Phase-Imaging Ion-Cyclotron mass measurement technique [6].

[1] B.J. Mount, M. Redshaw, E.G. Myers, Phys. Rev. Lett. 103, 122502 (2009).
[2] J. S. E. Wieslander, J. Suhonen, T. Eronen et al., Phys. Rev. Lett. 103, 122501 (2009).
[3] H. Ejiri, J. Suhonen, K. Zuber, Phys. Rep. 797, 1-102 (2019).
[4] T. Eronen et al., Eur. Phys. J. A 48, 46 (2012).
[5] D. Nesterenko et al., Eur. Phys. J. A 54, 154 (2018).
[6] S. Eliseev et al., Appl. Phys. B 114, 107 (2014).

Speaker: Tommi Eronen (University of Jyväskylä)
• 15:20
GERDA Highlights: Probing the Majorana Neutrino Mass at 100 meV 20m Main Venue

#### Main Venue

Since 2010, the GERDA project has been operated at Laboratori Nazionali del Gran Sasso (LNGS), searching for the neutrinoless double beta decay (0νββ) of Ge-76 to Se-76. GERDA is nowadays completing its mission, having attained 100 kgy exposure and, as first experiment, surpassed the goal sensitivity of 10^26 yr on the half-life of the searched process. Since its beginning in 2010 GERDA has increased its sensitivity for the measurement of the decay by almost a factor of 5, thanks to excellent passive shield setup, operating procedures, energy resolution, and implementation of active background suppression strategies. The GERDA results allow to directly probe the Majorana neutrino mass down to about 100 meV scale.
In this talk, the GERDA setup, technological features and operation will be summarized, and the above outlined results, based on an exposure of about 85 kgy, will be reviewed in the framework of results from other 0νββ players. The Ge-76 two neutrino double beta decay half-life measured by GERDA, the main detected background sources, the performances and background indexes for the different detector types, the data analysis flow and algorithms will be discussed as well.
The perspectives of the final GERDA data release and the transition to the LEGEND project will be addressed.

Speaker: Dr Carla Maria Cattadori (INFN Milano Bicocca)
• 15:20
Simulation of nuclear reactions for the NUMEN project 20m Parallel Venue

#### Parallel Venue

The GEANT4 [1] Hadrontherapy model [2] was used to predict the outcome of several reactions of interest to the NUMEN project (LNS/INFN, Catania, Italy). In this project, Double Charge Exchange (DCE) reaction matrix elements of interest to neutrino double-beta decay physics are to be experimentally assessed. In the last phase of the NUMEN project, very large intensity beams from the CS cyclotron accelerator (LNS) are to be used. In association with the MAGNEX spectrometer, which will identify the species of the DCE projectile-like fragment (PLF), a gamma-array spectrometer will assist the identification of the specific nuclear state which has been populated, by coincidence/anti-coincidence with the gamma transitions of the PLF. With the high beam intensity, a large random coincidence rate is expected which could contaminate the DCE data. This contamination would come from uncorrelated nuclear reactions of all types of exit channels which can originate from the same beam/target combination of the entrance channel. Besides evaluating the radiation risks to detectors and electronic equipment, GEANT4 simulations help to develop the gamma array project through the prediction of its response to gamma rays and neutrons from all these possible nuclear reactions. In this contribution, the results for several reactions will be shown, providing a general panorama of the issues that can affect the NUMEN project. In an attempt to validate these simulations, the gamma-ray and neutron spectra obtained with the Eden liquid scintillator array was measured during the Numen8 experiment, in which the 18O+76Se reaction was investigated at 15 AMeV. The results show some good correspondence with the simulation in some respects, like the order of magnitude of the gamma-ray rate and spectrum shape, but also puzzling results in other aspects, such as the random coincidence background rates of neutron and gamma and their relative ratios. Other types of simulation software have also been employed by the collaboration and were compared. Further validation tests should be performed for a more general and in depth investigation.

[1] http://geant4-userdoc.web.cern.ch/geant4-userdoc/UsersGuides/PhysicsReferenceManual/html/
[2] G. A. P. Cirrone, et al., Frontiers in Oncology, vol. 7, Sept. 2017.

Speaker: Prof. José Roberto Brandão de Oliveira (Universidade de São Paulo, São Paulo, SP, Brazil)
• 15:40
Nuclear responses for double beta decay and muon capture 20m Parallel Venue

#### Parallel Venue

To describe the double beta decay processes reliably one needs a possibility to test the
involved virtual transitions against experimental data. In this work we manifest how to utilise
the OMC data in the study of $0\nu\beta\beta$ decay.
We calculate the OMC strength function in $^{100}$Nb and compare it with the experimental strength function
measured at RCNP in Osaka. We also compute the OMC rates
to the daughter nuclei of some $0\nu\beta\beta$ decay triplets of immediate experimental interest and compare the
results with available data.

We perform the present computations in extended no-core
single-particle model spaces using the proton-neutron quasiparticle
random-phase approximation (pnQRPA) in order to correctly describe the OMC up to and beyond the giant-resonance
region.

According to our results ,the calculated first OMC giant resonance in $^{100}$Nb is in agreement with the experimental value.
Also the capture rates to low-lying states of $^{76}$As are in accordance.
However, the total capture rates are higher than the Primakoff estimate which refers to quenched $g_A$ value.
Eventually, the OMC process can be used to probe the structure of the
intermediate states appearing in the double-beta-decay process. Future experiments can help
fine-tune the nuclear-structure parameters for the double-beta-decay calculations.

Speaker: Lotta Jokiniemi (University of Jyväskylä)
• 15:40
Update on the HOLMES experiment to directly measure the neutrino mass 20m Main Venue

#### Main Venue

The absolute neutrino mass is still a missing parameter in the modern landscape of particle physics. The HOLMES experiment aims at exploiting the calorimetric approach to directly measure the neutrino mass through the kinematic measurement of the decay products of the weakly-mediated decay of 163Ho. This low energy decaying isotope, in fact, undergoes electron capture emitting a neutrino and leaving its daughter nucleus, 163Dy*, in an atomic excited state. This, in turn, relaxes by emitting electrons and, to a considerably lesser extent, photons. The high energy portion of the calorimetric spectrum of this decay is affected by the non-vanishing neutrino mass value. Given the small fraction of events falling in the region of interest, to achieve a high experimental sensitivity on the neutrino mass it is important to have a high activity combined with a very small undetected pile-up contribution. To achieve these targets, the final configuration of HOLMES foresees the deployment of a large number of 163Ho ion-implanted TESs characterized by an ambitiously high activity of 300 Hz each. This contribution will provide an overview on the status of the major tasks that will bring HOLMES to achieve a statistical sensitivity on the neutrino mass as low as 2 eV: from the isotope production and embedding to the detector production and readout.

Speaker: Marco Faverzani
• 16:00 16:30
Coffee/Tea Break 30m
• 16:30 18:00
Invited Talks Main Venue

#### Main Venue

• 16:30
The role of neutrino-nucleus reactions in supernova nucleosynthesis 30m

Neutrinos play an important role for the supernova dynamics and the
associated nucleosynthesis. During collapse, electron neutrinos, produced
by electron capture on nuclei, dominate, while all neutrino families are
being produced during the cooling phase of the protoneutron star.

Neutrinos are crucial for the explosive nucleosynthesis. At first, by
interaction with free nucleons they determine the proton-to-neutron ratio
of the ejected matter which is crucial for the subsequent
nucleosynthesis. Modern supernova simulations indicate that the ejected
matter is not sufficiently neutron rich to support an r-process which also
produces the solar abundances in the third r-process peak.

Neutrino-induced spallation reactions on abundant nuclei in the outer
stellar shells are responsible for the production of selected nuclides
(neutrino nucleosynthesis). Recently the first study of neutrino
nucleosynthesis has been presented which considers the time-dependence
of the neutrino emission including the neutrino burst, the accretion phase
and the cooling phase as well as changes in the spectral forms of the
neutrinos.

• 17:00
Impact of electron capture rates on nuclei far from stability on core-collapse supernovae 30m

The impact of different microphysics inputs on the dynamics of core collapse
during infall and early post-bounce is studied performing spherically symmetric simulations in general relativity using a multigroup scheme for neutrino transport and full nuclear distributions in extended nuclear statistical equilibrium models.
We show that the individual EC rates are the most important source of uncertainty in the simulations, and establish a list of the most important nuclei to be studied in order to constrain the global rates.
The effect on the collapse dynamics and neutrino luminosity is studied.

Speaker: Francesca Gulminelli (LPC Caen and University of Caen, France)
• 17:30
HALO-1kT - Status and Design 30m

HALO-1kT is a lead-based supernova neutrino detector proposed for the Laboratori Nazionali del Gran Sasso (LNGS). By utilizing lead from the decommissioning of the OPERA detector at LNGS, HALO-1kT will improve of the sensitivity of the Helium and Lead Observatory (HALO), that has been running in SNOLAB in Canada for the past 7 years, by a factor of ~25. The lead-based neutrino detection technology takes advantage of the large neutrino-nuclear cross sections for lead, and Pauli-blocking of the anti-electron-neutrino charged current channel, to offer a robust, low cost and low maintenance electron-neutrino-sensitive detector that complements water Cherenkov and liquid scintillator neutrino detectors. Neutrino detection is through charged and neutral current interactions with the lead nuclei that expel neutrinos that a subsequently detected with high efficiency in Helium-3 proportional counters. The talk will focus on the physics capabilities of the detector; aspects of its design; and its current status.

Speaker: Clarence Virtue (Laurentian University / SNOLAB)
• 18:00 19:00
Poster Session 1h
• Tuesday, 25 February
• 08:30 10:30
Invited Talks Main Venue

#### Main Venue

• 08:30
Hunting Down Solar Neutrinos; an Extraordinary South African Particle Physics Safari. 30m

The detection of the neutrino and subsequently the solar neutrino had stood for over 25 years as a major challenge for nuclear physicists. The presentation is a narrative of the ground-breaking experiment of the joint South African and American teams of JPF Sellschop and F. Reines for the search of cosmic ray neutrino in the early sixties. The Case Western-Wits team operated a gigantic for its time liquid scintillator detector at an unbelievable depth of almost 3,5 Km undergound in the East Rand Proprietary Gold Mine (EPRM) in Johannesburg. After six years of preparations and operation the first evidence of high-energy cosmic ray neutrino interactions was published in 1965 in Physical Review Letters. This achievement was the determining factor for the career of JPF Sellschop and in certain respects for the development of Nuclear Physics in South Africa.

• 09:00
First results from the neutrino mass experiment KATRIN 30m

Since the discovery of neutrino oscillation we know that neutrinos have non-zero masses, but we still do not know the absolute neutrino mass scale, which is as important for cosmology as for particle physics. The direct search for a non-zero neutrino mass from endpoint spectra of weak decays is complementary to the search for neutrinoless double beta-decay and analyses of cosmological data.
Today the most stringent direct limits on the neutrino mass originate from investigations of the electron energy spectra of tritium beta-decay.

The next generation experiment KATRIN, the Karlsruhe Tritium Neutrino experiment, is improving the sensitivity from the tritium beta decay experiments at Mainz and Troitsk of 2 eV by one order of magnitude probing the region relevant for structure formation in the universe. KATRIN uses a strong windowless gaseous molecular tritium source combined with a huge MAC-E-Filter as electron spectrometer. To achieve the sensitivity, KATRIN has been putting many technologies at their limits. The full 70m long setup has been successfully commissioned. From early 2019 on KATRIN is taking high statistics tritium data hunting for the neutrino mass.

In this talk a detailed presentation of the KATRIN experiment and its results from the first KATRIN science run will be given. The new results are already bringing KATRIN into the lead position of the field. In the outlook the perspectives of KATRIN for the coming years and new technologies to potentially improve further the sensitivity on the neutino mass will be presented.

Speaker: Christian Weinheimer (Institut für Kernphysik, University of Münster, Germany)
• 09:30
Precision mass measurements for nuclear and neutrino physics studies 30m

Rapidly developing neutrino physics has found in Penning-trap mass spectrometry a staunch ally in investigating and contributing to a variety of fundamental problems. The most familiar are the absolute neutrino mass and the possible existence of resonant neutrinoless double-electron capture / double-beta dacay and of keV-sterile neutrinos. This review provides an overview on the latest achievements and future perspectives of Penning-trap mass spectrometry on short-lived as well as stable nuclides with applications in nuclear structure, neutrino physics and most recently even in dark matter searches where relative mass uncertainties at the level of 10-11 and below are required.

Speaker: Prof. Klaus Blaum (Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany )
• 10:00
The Electron Capture in $^{163}$Ho experiment, ECHo 30m

The goal of the Electron Capture in $^{163}$Ho (ECHo) experiment is the determination of the electron neutrino mass by the analysis of the electron capture spectrum of $^{163}$Ho. The detector technology is based on metallic magnetic calorimeters operated at a temperature of about 10 mK in a reduced background environment. For the first phase of the experiment, ECHo-1k, the detector production has been optimized and the implantation process of high purity $^{163}$Ho source in large detector arrays has been refined. The implanted detectors have been successfully operated and characterized at low temperatures, reaching an energy resolution below 5 eV. High statistics and high resolution $^{163}$Ho spectra have been acquired and analyzed in the light of the recent advanced theoretical description of the spectral shape, considering the independently determined and more precise value of the energy available to the electron capture process, $Q_{\rm EC}$. We present preliminary results obtained in ECHo-1k so far and discuss the necessary upgrades towards the second phase of the experiment, ECHo-100k.

Speaker: Christian Enss for the ECHo Collaboration (Kirchhoff Institute for Physics)
• 10:30 11:00
Coffee/Tea Break 30m
• 11:00 13:00
Invited Talks Main Venue

#### Main Venue

• 11:00
Probing Dark Energy with the SKA in Africa 30m

I will survey the progress towards the SKA radio telescope array, including the successful building and operation of South Africa's MeerKAT array. Then I will focus on how these instruments can deliver new measurements and insights about the Dark Energy that is driving the accelerated expansion of the Universe.

Speaker: Prof. Roy Maartens (University of the Western Cape)
• 11:30
Dark Matter Direct Detection with Noble Liquids 30m

What is the Dark Matter which makes 85% of the matter in the Universe? We have been asking this question for many decades and used a variety of experimental approaches to address it, with detectors on Earth and in space. Yet, the nature of Dark Matter remains a mystery. An answer to this fundamental question will likely come from ongoing and future searches with accelerators, indirect and direct detection. Detection of a Dark Matter signal in an ultra-low background terrestrial detector will provide the most direct evidence of its existence and will represent a ground-breaking discovery in physics and cosmology. I will review direct detection experiments using noble liquids which have shown the highest sensitivity to-date.

Speaker: Elena Aprile (Columbia University)
• 12:00
Annual modulation with DAMA/LIBRA-phase2 30m

Abstract: The new results obtained by the first 6 independent annual cycles of DAMA/LIBRA–phase2 experiment deep underground at Gran Sasso are presented; they correspond to a total exposure of 1.13 ton × yr. The improved experimental configuration with respect to the phase1 allowed a lower energy threshold. The DAMA/LIBRA–phase2 data confirm the evidence of a signal that meets all the requirements of the model independent Dark Matter annual modulation signature, at high C.L. The model independent DM annual modulation result is compatible with a wide set of DM candidates. In this talk we summarize some of them and perspectives for the future will be outlined.

Speaker: Prof. Pierluigi Belli (INFN Roma Tor Vergata)
• 12:30
COSINE experiment - A WIMP dark matter search experiment with NaI(Tl) detectors 30m

The COSINE experiment searches for interactions of Weakly Interacting Massive Particles (WIMPs) using an array of NaI(Tl) crystal detectors in the 700-m-deep Yangyang underground laboratory, Korea. The main goal is to check the annual modulation signal observed by DAMA/LIBRA with the same target material. The first phase of the experiment, COSINE-100 with 106 kg of NaI(Tl) crystals, has been running stably for more than 3 years. Several analyses in addition to the annual modulation have been actively ongoing, based on the 1 keV energy threshold and about 3 counts/day/kg/keV background rate in an energy region between 1 and 6 keV. In this talk, the detector performance, recent analysis results, and future prospects of the COSINE experiment will be presented.

Speaker: Yeongduk Kim (Institute for Basic Science)
• 13:00 14:00
Lunch 1h
• 14:00 16:00
Contributed Talks Main Venue and Parallel Venue

#### Main Venue and Parallel Venue

• 14:00
Enlightening the dark with XENON1T and looking forward to XENONnT 20m Parallel Venue

#### Parallel Venue

The most recent results of the XENON1T direct dark matter detector will be presented. XENON1T was a two-phase xenon TPC using 248 low radioactivity PMTs to detect scintillation signals in a 2-ton active liquid xenon target. The detector was operational between 2016 and 2018 at the Laboratori Nazionale del Gran Sasso with continuously improving xenon purity and reduction of the internal Kr-85 background source. In addition to WIMP searches, XENON1T also produced important results on nuclear processes, such as the double electron capture of 124Xe, and is sensitive to flavour independent measurements of solar and supernova neutrinos. The status of the successor experiment, XENONnT will be discussed, as well as projections for WIMP and neutrinoless double beta decay searches.

Speaker: Jacques Pienaar (University of Chicago)
• 14:00
The CROSS experiment: rejecting surface events with PSD 20m Main Venue

#### Main Venue

Neutrinoless double-beta decay is a hypothetical rare nuclear transition (T^1/2>1026 y). Its observation would provide an important insight about the nature of neutrinos (Dirac or Majorana particle) demonstrating that the lepton number is not conserved. This decay can be investigated with bolometers embedding the double beta decay isotope, the possibility to investigate this rare process is strongly influenced by the background level in the region of interest. A new R&D has recently begun within the CROSS project (Cryogenic Rare-event Observatory with Surface Sensitivity) aiming at the development of bolometric detectors, embedding the promising isotopes 100Mo and 130Te, capable of discriminating surface alpha and beta interactions by exploiting the properties of superconducting material (Al film) or normal metal (Pd film) deposited on the crystal faces (Li2MoO4 and TeO2). These films work as pulse-shape modifiers. The results of the tests on prototypes performed at CSNSM (Orsay, France) showed the capability of a few-µm (nm)-thick Al (Pd) film deposited on the crystal surface to discriminate surface from bulk events, with the required rejection level of the surface background. While Al film can only identify surface alpha particles, there are preliminary indications that normal-metal films can separate also the beta surface component. This is a breakthrough in bolometric technology for double beta decay that could lead to reach a background index in the range 10^-5 counts/(keV kg y). The CROSS cryostat has been recently installed underground (Canfranc, Spain). We plan to run the first CROSS demonstrator in 2021 with 32 enriched Li2100MoO4 crystals containing ~5 kg of 100Mo. A 5-year sensitivity to the effective Majorana neutrino mass mββ with a background of the order of 10^-3 counts /(keV kg y) would be in the range 68-122 meV (2.8 × 10^25 y), at the level of the best currently running experiments.

Speaker: Ms Hawraa Khalife (CSNSM-cnrs (orsay, France))
• 14:20
COSINUS, Dark Matter direct detection with NaI 20m Parallel Venue

#### Parallel Venue

Nowadays astronomical observations have provided solid proof for the existence of dark matter (DM), yet a direct measurement is lacking.
COSINUS (Cryogenic Observatory for SIgnatures seen in Next-generation Underground Searches) has the aim of detecting DM via elastic scattering off the nuclei of a target NaI crystal which is the core of the detector. The NaI crystal is kept at ~10 mK and it is operated as a low-temperature calorimeter. The deposited energy is precisely reconstructed from the phonon signal. By facing to the NaI crystal another cryogenic light detector particle discrimination is achieved using the scintillation signal. With this unique combined readout not only it is possible to eliminate the beta/gamma and alpha background, but also to study the material dependency of the DM interaction. Moreover, using the identical material as DAMA/LIBRA, COSINUS will finally shade a light on the long-standing controversy in the DM direct search community.
In this contribution I will outline the steps undertaken by the COSINUS collaboration towards establishing a final detector design and I will present the results of the first NaI prototypes.
The basic detector module is composed by a NaI crystal (up to 200 g mass) coupled to a Transition Edge Sensor (TES) via a carrier crystal (typically CdWO4) for practical purposes:being hygroscopic, NaI requires very special care in handling and does not cope well with the high temperature required to grow the thin superconducting W film of the TES. Except for the side where the NaI crystal is coupled to the carrier, all the other sides face a silicon beaker which encapsulates the NaI crystal and it is used as a light absorber. The emitted light is converted into a phonon signal which is read out using a second TES evaporated directly onto the silicon beaker external surface.
A prototype detector has been tested in a dilution refrigerator hosted in Hall C of the Laboratori Nazionali del Gran Sasso (LNGS), instrumented both with SQUIDs for the TES readout and conventional electronics for high impedance sensors, such as Neutron Transmutation Doped (NTD) Germanium thermistors.
I will present the first measurements perfomed with prototype detectors, the current status and further development of COSINUS concerning the experimental setup at LNGS and physics programme.

Speaker: Andrei Puiu (INFN and University of Milano Bicocca)
• 14:20
Sensitivity to the neutrinoless double beta decay of the DARWIN observatory 20m Main Venue

#### Main Venue

The DARWIN observatory is a proposed next-generation experiment whose primary goal is to search for particle dark matter. It will operate 50 tonnes of natural xenon in a dual-phase time projection chamber under ultra-low background conditions. These two characteristics make DARWIN sensitive to other rare interactions, like the neutrinoless double beta decay of the isotope Xe136. Without isotopic enrichment DARWIN will contain in total more than 4.5t of Xe136. We present here the expected half-life sensitivity for this rare decay. This sensitivity is based on a detailed study of attainable backgrounds, Monte Carlo predictions and event topologies in the homogeneous target. We show that DARWIN will be comparable in its science reach to dedicated double beta decay experiments using enriched Xe136.

Speaker: Dr Patricia Sanchez-Lucas (University of Zurich)
• 14:40
Prospects for pair-transfer reactions at iThemba LABS 20m Main Venue

#### Main Venue

Pair-transfer reactions such as (p,t) and (3He,n) have been used to probe the pairing in nuclei. The nature of pairing in neutrinoless double-beta decay candidates can strongly impact the predicted nuclear matrix elements linking the ground states of the parent and daughter nuclei in neutrinoless double-beta decay candidates, with various different theoretical approaches such as the QRPA sometimes using the BCS pairing approximation. Evidence from pair-transfer reactions provides evidence for the breaking down of the BCS approximation in some nuclei.

This contribution will discuss experimental developments at iThemba LABS using the K600 magnetic spectrometer to measure (p,t) cross sections, and arrays of HPGe and neutron detectors to measure the (3He,n) reaction, providing an excellent opportunity to probe the nature of pairing in nuclei, including neutrinoless double-beta decay candidates.

Speaker: Dr Philip Adsley (iThemba LABS/Wits)
• 14:40
ReD: a SiPM based LAr TPC for directionality studies 20m Parallel Venue

#### Parallel Venue

The Recoil Directionality project (ReD) within the DarkSide Collaboration aims to characterize the light and charge response of a liquid argon (LAr) dual-phase Time Projection Chamber (TPC) to neutron-induced nuclear recoils. The main goal of the project is to probe for the possible directional dependence suggested by the SCENE experiment. Furthermore, ReD will have the possibility to study the response of a LAr TPC to very low-energy nuclear recoils. Sensitivity to directionality and to low-energy recoils are both key assets for future argon-based experiments looking for Dark Matter in the form of WIMPs.

ReD consists in the irradiation of a miniaturized LAr TPC with a neutron beam at the INFN, Laboratori Nazionali del Sud (LNS), Catania. Neutrons are produced via the reaction p($^7$Li,$^7$Be)n from a primary $^7$Li beam delivered by the TANDEM accelerator of LNS. A $\Delta$E/E telescope, made by two Si detectors, identifies the charged particles ($^7$Be) which accompany the neutrons emitted towards the TPC. The core detector of ReD is a small custom-made double phase LAr TPC, having sensitive volume of 5×5×5 cm$^3$. The ReD TPC uses all the innovative features of the DarkSide-20k design: in particular the optoelectronic readout based on SiPM and the cryogenic electronics. It is thus a valuable test bench of the technology which is being developed for DarkSide-20k and for the future project Argo. Neutrons scattered from the TPC are eventually detected by using an array of nine 3-inch liquid scintillator (LSci) detectors. All LSci are placed such to tag recoils having the same energy, i.e. the same scattering angle with respect to the incident neutron, but different angle with respect to the drift field of the LAr TPC, thus allowing to search for a possible directional response.
The integration of the three detector systems was performed within several test beams performed in 2018-2019, using the TANDEM accelerator of LNS. Neutrons were produced by sending a $^7$Li 28 MeV beam onto a set of CH$_2$ targets having thickness between 250 and 400 $\mu$g/cm$^2$.

The physics measurement is expected to take place during the early months of 2020. This contribution will report about the current status of the project, including the physics results possibly obtained in the meanwhile, and on the short- and medium-term plans. The feasibility is also discussed of a wider-purpose facility at INFN-LNS, targeted to the calibration of detectors of interest for Dark Matter or rare events searches with tagged neutrons.

Speaker: Luciano Pandola (INFN - Laboratori Nazionali del Sud)
• 15:00
Borexino solar neutrino data as a probe of non-standard neutrino properties 20m Parallel Venue

#### Parallel Venue

Neutrinos produced in the Sun can be used as a probe of neutrino physics beyond the Standard Model (BSM). In this study, two BSM processes are considered, namely, non-standard neutrino-electron interactions, and electromagnetic neutrino interaction caused by an anomalous magnetic moment. These processes may occur during both neutrino propagation through the solar matter and detection, causing distortions in solar neutrino fluxes, survival probability, interaction cross sections and other properties. In the Borexino experiment, possible impacts of the non-standard interactions of solar neutrinos to the data have been estimated using both interaction rate and spectral information. For the anomalous neutrino magnetic moment study, both neutrino and anti-neutrino datasets have been considered.

Speaker: Alina Vishneva (JINR)
• 15:00
EARTH, a meeting of neutrino- and nuclear- physics. 20m Main Venue

#### Main Venue

Over the past 15 years, in the consortium EARTH (Earth AntineutRino TomograpHy), low energy experiments have been carried out with the detection of antineutrinos as a theme. The ultimate goal was to learn more about the role of nuclear decay in the interior of the Earth [1-3]. This required developing direction sensitive antineutrino detection to detect geoneutrinos. Here searching for remnants of possible nuclear reactions may also provide clues [4]. Other experiments were done into whether neutrinos from the Sun have a greater influence on radioactive decay than is commonly accepted by using antineutrinos from reactors as a surrogate to investigate these claims [5]. The work done on these unfinished projects will be reviewed and some ideas for future work will be given.

[1] R.J. de Meijer et al., Earth, Moon and Planets 99 (2006) 193
[2] F.D. Smit et al., PoS (FNDA2006) 096
[3] F.D. Brooks et al., AIP Conference Proceedings 1412, 177 (2011)
[4] R.J. de Meijer et al., Radiation Physics and Chemistry 71 (2004) 769
[5] R.J. de Meijer et al., Applied Radiation and Isotopes 69 (2011) 320

Speaker: Dr Frederick Smit (NRF iThemba LABS, Somerset West, South Africa)
• 15:20
BBN, Underground Nuclear Astrophysics and Neutrinos 20m Parallel Venue

#### Parallel Venue

Nuclear astrophysics plays an important role in understanding open issues of neutrino physics. As an example, the two key reactions of the solar p-p chain $^3He(^3He,2p)^4He$ and $^3He(^4He,\gamma)^7Be$ were studied at low energy with LUNA (Laboratory for Underground Nuclear Astrophysics), providing an accurate experimental footing for the Standard Solar Model and consequently to study the neutrino mixing parameters.
The LUNA collaboration has now completed the measurement of the $D(p,\gamma)^3He$ cross section with unprecedented precision at Big Bang Nucleosynthesis (BBN) energies. The accurate study of this deuterium-burning process provides a precise determination of the universal baryon density $\Omega_b$, in agreement with the value derived from CMB data and with comparable accuracy.
Finally, our analysis severely constrains the possible existence of "dark radiation", i.e. the existence of relativistic particles not foreseen in the standard model, such as sterile neutrinos or hot axions [1]. The LUNA result and consequences in cosmology and particle physics are discussed in this contribution.

[1] E. Di Valentino, C. Gustavino et al., Phys. Rev. D 90, 023543 (2014).

Speaker: Dr Carlo Gustavino (INFN-Roma)
• 15:20
COHERENT’s Neutrino-Induced Neutron Detectors 20m Main Venue

#### Main Venue

Neutrino-nucleus interactions can produce excited nuclear states that can de-excite by emitting particles, including neutrons. Neutrino-induced neutrons (NINs) produced in common gamma shielding material, such as lead or iron, can pose a background for neutrino and dark matter experiments. Additionally, NIN production in lead is the primary mechanism for the Helium and Lead Observatory (HALO) to detect supernova neutrinos, and iron-based supernova NIN detectors have been proposed. As part of the COHERENT experiment, two detectors seeking to study NIN production in lead and iron have been deployed to the Spallation Neutron Source (SNS). An overview of the detector design and current status will be presented.

Speaker: Samuel Hedges (Duke University)
• 15:40
- 20m Parallel Venue

#### Parallel Venue

• 15:40
NEON - Neutrino Elastic-scattering Observation with NaI(Tl) 20m

NEON is a proposed experiment to detect coherent elastic neutrino-nucleus scattering (CENNS) with high light yield NaI(Tl) detectors and a reactor as antinuetrino source. Due to extremely low energy signal predicted from the CENNS process, one needs to develop extremely low threshold detectors. We have optimized size of the crystals and developed new optical coupling design for high light collection efficiency. With current best crystal of approximately 23 photoelectrons per keV, a sub-keV scintillation signal is accessible with the NaI(Tl) crystals. We consider to install approximately 10~kg target mass at Hanbit reactor power plant, which is same place of the NEOS short baseline neutrino experiment, in early 2020. The site is 24 m far from reactor core with measured antineutrino flux of 7$\times$10$^{-12}$/cm$^2$/s. We will present current status of detector developments as well as our strategy for an observation of CENNS process with the reactor antineutrino.

Speaker: Dr Hyunsu Lee (Institute for Basic Science)
• 16:00 16:30
Coffee/Tea Break 30m
• 16:30 18:30
Invited Talks Main Venue

#### Main Venue

• 16:30
Title to be confirmed 30m
• 17:00
Title to be confirmed 30m
Speaker: Prof. Attila Krasznahorkay (Inst. for Nucl. Res., Hung. Acad. of Sci. (MTA-Atomki), Debrecenn, Hungary)
• 17:30
Title to be confirmed 30m
Speaker: Andrea Longhin
• 18:00
Liquid0 detector developments 30m

In this talk I will present a potentially game-changing new particle detector technology called LiquidO. This idea turns the concept behind the widespread scintillator detectors on its head: for 50 years research has focussed on making more and more transparent scintillator materials, whereas LiquidO actually requires an opaque scintillator. In LiquidO,
scintillation light is confined near its creation point due to a short scattering length and collected by a dense grid of wavelength shifting fibres. The resulting topological information, normally lost in transparent LS detectors, allows for powerful event-by-event particle identification including MeV-scale positrons, electrons and gammas, enabling strong background suppression. Another advantage over classical liquid scintillator detectors is the possibility of loading to unprecedented levels, since high transparency is no longer required. I will give an overview of the LiquidO idea in this talk as well as show the first results from the ’micro-LiquidO’ prototype detector, which provided the proof of principle of light confinement.

Speaker: Jeff Hartnell
• Wednesday, 26 February
• 08:30 10:30
Invited Talks Main Venue

#### Main Venue

• 08:30
First-forbidden transitions in the reactor antineutrino ux and spectral anomalies 30m

It has been almost a decade since the reactor antineutrino anomaly entered the stage, where the number of experimentally detected antineutrinos emerging from a nuclear power reactor interior was signi?cantly less than theoretically predicted from nuclear ? decay. This has, in turn, motivated the search for an eV-scale sterile neutrino in several very short baseline experiments, none of which have so far confi?rmed its existence. From the theory point of view, initial analyses introduced a signi?cant number of approximations, in particular for the treatment of so-called forbidden transitions. We report on the first large-scale calculation of the influence of ?first-forbidden ?transitions using state-of-the-art nuclear shell model calculations for a select number of highly-contributing ? branches. We use these results to propose a probability distribution for ?first-forbidden spectral shapes and employ Monte Carlo techniques to translate this into a detailed construction of theoretical uncertainties for the remaining forbidden transitions. We observed signi?cant changes in both the integrated
ux and spectral shape of the cumulative antineutrino spectra spectra for all ?ssion actinides [1, 2], and discuss both a mitigation of the so-called reactor shoulder and changes in the reactor antineutrino anomaly. Finally, we will comment how an improved treatment of allowed ? transitions [2, 3] can further signi?cantly change both ux and spectral shape.
[1] L. Hayen, J. Kostensalo, N. Severijns, and J. Suhonen, Physical Review C 99, 031301(R) (2019).
[2] L. Hayen, J. Kostensalo, N. Severijns, and J. Suhonen, Physical Review C 100, 054323 (2019), arXiv:1805.12259.
[3] L. Hayen, N. Severijns, K. Bodek, D. Rozpedzik, and X. Mougeot, Reviews of Modern Physics 90, 015008 (2018),
arXiv:1709.07530.

Speaker: Leendert Hayen (North Carolina State University & Triangle Universities Nuclear Laboratory)
• 09:00
Title to be confirmed 30m
Speaker: Karsten Heeger
• 09:30
Title to be confirmed 30m
Speaker: Manfred Lindner (Max-Planck-Institut für Kernphysik)
• 10:00
Title to be confirmed 30m
Speaker: Jason Holt (TRIUMF)
• 10:30 11:00
Coffee/Tea Break 30m
• 11:00 13:00
Invited Talks Main Venue

#### Main Venue

• 11:00
Majorana neutrino mass generation, $0\nu\beta\beta$-decay and nuclear matrix elements 30m

: A Quark Condensate See-Saw (QCSS) mechanism of generation of Majorana neutrino mass due to spontaneous breaking of chiral symmetry accompanied with the formation of a quark condensate is presented. Consequencies of this scenario of neutrino mass generation for the neutrinoless double beta decay ($0\nu\beta\beta$-decay), tritium beta decay and cosmological measurements are drawn. The attention is paid also to the problem of reliable calculation of the $0\nu\beta\beta$-decay nuclear matrix elements and the evaluation of quenching of the axial-vector coupling constant $g_A$.
For solving of these nuclear physics problems an importance of experimental study of the two-neutrino double-beta decay, muon capture in nuclei and nuclear charge-exchange reactions is stressed.

Speaker: Fedor Simkovic (Comenius University)
• 11:30
Title to be confirmed 30m
Speaker: Takaharu Otsuka (Department of Physics, University of Tokyo)
• 12:00
Title to be confirmed 30m
Speaker: Eligio Lisi
• 12:30
Title to be confirmed 30m
Speaker: Javier Menendez (University of Barcelona)
• 13:00 14:00
Lunch 1h
• 14:00 18:00
Excursion 4h
• Thursday, 27 February
• 08:30 10:30
Invited Talks Main Venue

#### Main Venue

• 08:30
Neutrinos in DUNE: long-baseline oscillations and non-beam physics 30m

The Deep Underground Neutrino Experiment (DUNE) is one of the most ambitious particle physics experiments of the next generation. DUNE consists of two detectors: the Near Detector (ND) - just downstream of the neutrino beam at FERMILAB (IL - USA), and the Far Detector (FD) - 1300 km away and 1500 m deep in the underground SURF laboratory (SD - USA). The ND is a multi-technology apparatus aiming to constrain the uncertainties related to the unoscillated neutrino flux and also to explore neutrino interactions physics. The FD is a modular 40 kton fiducial mass Liquid Argon Time Projection Chamber, dedicated to studying long-baseline neutrino oscillations, which includes precise measurements of neutrino mixing parameters, the CP violation phase as well as the determination of neutrino mass hierarchy. The physics list of DUNE extends to non-beam physics like supernova neutrinos and search for nucleon decay. In this contribution, we describe the main features of DUNE and its sensitivity for measurements on the primary physics goals.

Speaker: Prof. Ernesto Kemp (University of Campinas - UNICAMP)
• 09:00
What we can learn from CEvNS? (CEvNS - Coherent Elastic Neutrino Nucleus Scattering) 30m

CEvNS process has been predicted in 1974 right after discovery of the neutral current of the week interactions. It took more than 40 years to confirm this prediction experimentally. In 2017 COHERENT collaboration reported of the first observation of CEvNS using 14 kg CsI detector and SNS neutrino source at the ORNL. In my talk I will review first observation of CEvNS and present experimental status to study CEvNS. The focus of my talk will be how we can use accurate CEvNS measurements to test S-M of the particle physics, and make contribution into nuclei physics and astrophysics.

Speaker: Yuri Efremenko (University of Tennessee, USA)
• 09:30
Status of the T2K experiment 30m

Current status of the T2K long-baseline neutrino-oscillation experiment is presented.
Future upgrades and prospects in coming ten years are also reported.

Speaker: Prof. Yuichi Oyama (KEK/J-PARC)
• 10:00
Status of the Mo-100 based AMoRE neutrinoless double beta decay experiment 30m

The AMoRE (Advanced Mo-based Rare process Experiment) intends to find an evidence for neutrinoless double beta decay of Mo-100 by using a cryogenic technique with molybdate based crystal scintillators. The crystals, which are cooled down to 10~20 mK temperatures, are equipped with MMC-type phonon and photon sensors to detect both thermal and scintillation signals produced by a particle interaction in the crystal to achieve high energy resolution and efficient particle discrimination. The AMoRE-pilot experiment with an array of six 48deplCa100MoO4 crystals with a total mass of about 1.9 kg was performed at the 700-m-deep YangYang underground laboratory and AMoRE-I preparation is in progress with ab ~ 6.1 kg of crystals, mostly 48deplCa100MoO4 and several R&D crystals such as Li2100MoO4 crystals. Significant improvement of effective Majorana neutrino mass sensitivity at the level of inverted hierarchy of neutrino mass, 20-50 meV, could be achieved by the AMoRE-II with 200 kg of molybdate crystals at the new 1,000 m deep underground laboratory excavated by the end of 2021 in the Yemi. Results of the AMoRE-pilot and status of the AMoRE-I and AMoRE-II preparation will be presented.

Speaker: Hong Joo Kim (Kyungpook National University)
• 10:30 11:00
Coffee/Tea Break 30m
• 11:00 13:00
Invited Talks Main Venue

#### Main Venue

• 11:00
Title to be confirmed 30m
Speaker: Smarajit Triambak (University of Western Cape)
• 11:30
Theory of Double-Beta Decay from First Principles 30m

I discuss recent work to calculate the nuclear matrix elements that govern neutrinoless double beta decay in an ab-initio way, that is, without the adjustment of parameters except those in chiral effective field theory. A method based on the use of techniques from energy-density functional theory in combination with ab-initio Hamiltonians has proved particularly powerful. I describe its application to the double-beta matrix elements of 48Ca and 76Ge.

Speaker: Dr Jonathan Engel
• 12:00
Title to be confirmed 30m
Speaker: Manuela Cavallaro (INFN - LNS)
• 12:30
Heavy ion charge exchange reactions as probes for nuclear β-decay 30m

The status and prospects of heavy ion charge exchange reactions are discussed. Their important role for nuclear reaction, nuclear structure, and beta-decay investigations is emphasized. Dealing with peripheral reactions, direct reaction theory gives at hand the proper methods for single (SCE) and double charge exchange (DCE) ion–ion scattering. The microscopic descriptions of charge exchange ion–ion residual interactions and the reaction mechanism are obtained by distorted wave theory. Ion–Ion optical potentials and reaction form factors are determined in a folding approach by using NN T-matrices and microscopic ground state and transition densities, respectively. The theory of onestep direct and two-step transfer reaction mechanisms for SCE reactions is discussed and illustrated in applications to data. Specific SCE reactions are discussed in detail, emphasizing the versatility of projectile–target combinations and incident energies. SCE reactions induced by 12C and 7Li beams are presented as representative examples. Heavy ion DCE reactions are shown to proceed in principle either by sequential pair transfer or two kinds of collisional NN processes. Double single charge exchange (DSCE) is given by two consecutive SCE processes, resembling in structure 2ν2β decay. A competing process is a two-nucleon mechanism, relying on short range NN correlations and leading to the correlated exchange of two charged mesons between projectile and target. These Majorana DCE (MDCE) events are of a similar diagrammatic structure as 0ν2β decay. The similarities of the DSCE and MDCE processes to pionic DCE reactions are elucidated. An overview on recent applications to heavy ion DCE data is given.

Speaker: Horst Lenske (U. Giessen)
• 13:00 14:00
Lunch 1h
• 14:00 15:40
Contributed Talks Main Venue and Parallel Venue

#### Main Venue and Parallel Venue

• 14:00
Limits on the spectral parameters of core-collapse neutrinos extracted from the Diffuse Supernovae Neutrino Flux (DSNvF). 20m Parallel Venue

#### Parallel Venue

In February 1987 neutrinos from the SN1987 traveled a distance of about 50 kpc from the Large Magellanic Cloud and were detected on Earth by two of the largest neutrino telescopes of that time, Kamiokande-II and IMB, thus confirming the vast amount of energy (~10^53 ergs) predicted to be emitted in neutrinos and setting allowed intervals for the emission parameters like the neutrinosphere temperature. The confirmation of the main features of neutrino emission for a single supernova also supports the prediction that all the past supernovae in the universe should originate a ubiquitous and isotropic neutrino flux, the so-called Diffuse Supernova Neutrino Flux (DSNvF). Up to now, no evidence of events from DSNvF was found by different neutrino telescopes. In this work, we use the upper limit on the DSNvF obtained from the null results of the Super-Kamiokande collaboration to estimate limits on average energy, spectral pinching, and neutrinosphere temperature for electron antineutrinos from a core-collapse neutrino burst. Finally, we check our results with those obtained from the solely SN1987a data concluding that the DSNvF may lead to comparable - or even better - upper limits on the neutrino emission parameters.

Speaker: Ernesto Kemp (University of Campinas - UNICAMP)
• 14:00
Tests of three-neutrino paradigm by MINOS and MINOS+ Experiments 20m Main Venue

#### Main Venue

MINOS and MINOS+ experiments collected unprecedented amount of data using two long baseline detectors that operated on axis of the NuMI neutrino beam at Fermilab. This has allowed to conduct some of the best measurements of neutrino oscillations that provide stringent constraints on neutrino mixing and transitions involving sterile neutrinos. We will present the latest results from these studies.

Speaker: Prof. Karol Lang (University of Texas at Austin)
• 14:20
Deflection of cosmic neutrino by a stellar magnetic field 20m Parallel Venue

#### Parallel Venue

Neutrinos in the Standard Model (SM) are considered neutral particles. However, recent experiments showed that the neutrino has infinitesimal electric charge leads to non-zero magnetic moment (μ) with precise constraints on the value, this electromagnetic interaction contribution enhances neutrino properties i.e. Oscillation, Scattering, and Spin. This work discusses the possible neutrino deflection under the influence of Interstellar Magnetic Field (IMF) or at extreme magnetic field condition exists in celestial objects, and for what limit could affect the neutrino flux measured at Earth. The primary results were validated by SN1987A supernovae arrival time data.

Speaker: Mr Mohamed Ismaiel (Helwan University)
• 14:20
Sterile neutrino searches with the ICARUS detector 20m Main Venue

#### Main Venue

The ICARUS collaboration employed the 760-ton T600 detector in a successful three-year physics run at the underground LNGS laboratories studying neutrino oscillations with the CNGS neutrino beam from CERN, and searching for atmospheric neutrino interactions. ICARUS performed a sensitive search for LSND-like anomalous $\nu_e$ appearance in the CNGS beam, which contributed to the constraints on the allowed parameters to a narrow region around 1 eV$^2$, where all the experimental results can be coherently accommodated at 90% C.L. After a significant overhauling at CERN, the T600 detector has now been placed in its experimental hall at Fermilab where installation activities are in progress. It will be soon exposed to the Booster Neutrino Beam to search for a sterile neutrino within the Short Baseline Neutrino (SBN) program, devoted to definitively clarify the open questions of the presently observed neutrino anomalies. The proposed contribution will address ICARUS achievements, its status and plans for the new run at Fermilab and the ongoing developments of the analysis tools needed to fulfill its physics program.

Speaker: Alessandro Menegolli
• 14:40
Detection of supernova neutrino signal with NOvA detectors 20m Parallel Venue

#### Parallel Venue

The NOvA experiment has two segmented liquid scintillation detectors,
which are sensitive to the neutrino signal from a core-collapse
supernova in our galaxy. Each of these detectors performs an online
reconstruction and analysis of the neutrino interaction candidates,
comparing their time distribution to that of the signals expected from a
core-collapse supernova. The statistical significance calculated in
this comparison is used to decide if a detector is currently observing a
supernova signal.

The combination of these significance values from both detectors
provides a more efficient metric for detecting the supernova signal,
increasing the maximum distance at which NOvA can detect a core-collapse
supernova.

NOvA's approach for its combination of two detectors for supernova
detection can be generalized to a network of various detectors with
different background levels and sensitivities.

Speaker: Andrey Sheshukov (Joint Institute for Nuclear Research)
• 14:40
Hints of non-unitarity in the present T2K and NO$\nu$A data 20m Main Venue

#### Main Venue

The mixing of three neutrino flavours is parameterised by the unitary
PMNS matrix. If there are more than three neutrino flavours, effective $3\times 3$ neutrino mixing
matrix will be non-unitary. In this paper, we have analysed the
latest T2K and NO$\nu$A data with the hypothesis of non-unitary mixing matrix.
Present results from NO$\nu$A and T2K collaboration have tension between them as NO$\nu$A disfavours T2K
best-fit point at $1\, \sigma$ confidence level and vice versa. In this paper we have shown that latest data from both the
experiments disfavour unitary $3\times 3$ mixing at $60\%$ C.L. The combined analysis disfavours unitary mixing
at $1\, \sigma$ C.L. Moreover, the tension between two experiments can also be reduced with the non-unitary approach.

Speaker: Dr Ushak Rahaman (University of Johannesburg)
• 15:00
Neutrino-induced reactions on $^{13}$C and $^{16}$O at supernova neutrino energies 20m Main Venue

#### Main Venue

Neutrino-nucleus reactions on $^{13}$C and $^{16}$O at supernova (SN) energies are investigated by shell-model calculations with the use of new Hamiltonian, which can describe spin responses of nuclei quite well. Cabon-based scintillators and water-Cerenkov scintillators relevent to SN observation and experiments at the spallation neutron sources are now available. Cross sections for various particle and $\gamma$ emission channels are evaluated by the statistical Hauser-Feshbach method.
For $^{13}$C, total reaction cross sections at reactor and solar neutrino energies were studied [1]. Here, we extend our study to SN neutrino energies up to $\approx$50 MeV, and evaluations of partial cross sections for proton and neutron emission channels within the Standard Model [2]. Among them, a reaction channel $^{13}$C ($\bar{\nu}$, $\bar{\nu}$'n) $^{12}$C (2$^{+}$, 4.44 MeV) followed by prompt 4.44 MeV $\gamma$ emission is discussed in relation to the shape distortion in the 5-7 MeV range in the measured neutrino spectrum in the short-baseline reactor neutrino experiments [3]. The cross section is too small to explain the extra enhancement in the spectrum.
Coherent elastic scattering cross section is obtained for ${13}$C, and compared with that for $^{12}$C. Nuclear structure effects in the cross sections are pointed out [2]. Possible merit of large recoil momenta in light nuclei for the study of neutron distributions in nuclei is discussed.
For $^{16}$O, spin-dipole strength, which are the dominant contributions to the cross sections, and neutrino-induced reaction cross sections on $^{16}$O are investigated [4]. Charged-current cross sections induced by SN neutrinos and their dependence on Mikheyev-Smirnov-Wolfenstein neutrino oscillations are discussed for a future SN burst [5].

[1] T. Suzuki, A. B. Balantekin and T. Kajino, Phys. Rev. C 86, 015502 (2012).
[2] T. Suzuki, A. B. Balantekin, T. Kajino and S. Chiba, J. Phys. G 46, 075103 (2019).
[3] J. M. Berryman, V. Brdar and P. Huber, Phys. Rev. D 99, 055045 (2019).
[4] T. Suzuki, S. Chiba, T. Yoshida, K. Takahashi and H. Umeda, Phys. Rev. C 98, 034613 (2018).
[5] K. Nakazato, T. Suzuki and M. Sakuda, PTEP 2018, 123E02 (2018).

Speaker: Prof. Toshio Suzuki (Nihon University)
• 15:00
Status and prospects of KM3NeT/ORCA 20m Parallel Venue

#### Parallel Venue

KM3NeT is the next-generation neutrino Cherenkov telescope currently under construction in the Mediterranean Sea. Its low energy configuration ORCA (Oscillations Research with Cosmics in the Abyss) is optimised for the detection of atmospheric neutrinos with energies above ∼1 GeV. The main research target of the ORCA detector is the measurement of the neutrino mass ordering (NMO) and atmospheric neutrino oscillation parameters. This contribution will present the first results on atmospheric neutrinos detected with the already deployed ORCA detection units. The projected sensitivity of the detector to the NMO will be shown, alongside prospects for early analyses of data collected with a small sub-array of the detector during construction phase. The ORCA potential for other physics topics, including dark matter, non-standard interactions, sterile neutrinos, and supernovae neutrino detection will also be presented.

Speaker: Dr Salvador Miranda Palacios (University of Johannesburg)
• 15:20
- 20m Parallel Venue

#### Parallel Venue

• 15:20
Axial Vector Form Factors of the Nucleon using lattice QCD 20m Main Venue

#### Main Venue

The success of experiments such as DUNE require the determination of neutrino flux and cross-section with nuclear targets with unprecedented accuracy. A crucial input in the calculations of these is the axial form factor. Starting from the standard model that defines the interaction of the axial current with quarks, one needs to include both QCD corrections that bind quarks into nucleons and nuclear effects that arise in heavy nuclear targets such as argon. Experimental access to the first, QCD corrections for nucleons, is prevented by safety concerns posed by liquid hydrogen targets. Axial and electromagnetic form factors of the nucleon can be calculated from first principals using lattice QCD. This talk will show that we now have control over all sources of systematic errors that arise in lattice QCD calculations and the axial form factors satisfy the PCAC relation, an essential and non-trivial check [see arXiv:1905.06470]. Finally, I will present state-of-the-art results at the physical pion mass and in the continuum limit and compare them with phenomenology. Prospects for reaching 1–2% accuracy will be discussed.

Speaker: Dr Rajan Gupta (Los Alamos National Laboratory)
• 15:40 16:00
Coffee/Tea Break 20m
• 16:00 17:30
Invited Talks Main Venue

#### Main Venue

• 16:00
Solar Models and Neutrino: where do we stand? 30m

In this talk, I will present the status of solar models, review the main limitations imposed by uncertain input physics in the models and by external constraints (aka solar abudances), and discuss the current constraints imposed from helioseismic and solar neutrino measurements. Also, I will discuss the implications that our current limitations in modeling the Sun have for stellar physics. Finally, some discussion will be devoted to the importance of a prospective measurement of solar neutrinos from the CN-cycle would have for solar models and other fields.

Speaker: Aldo Serenelli (Institute of Space Sciences (ICE-CSIC))
• 16:30
Status and perspectives of the Hyper-Kamiokande project 30m

A future neutrino experiment based in Japan, Hyper-Kamiokande (HK) consists of a high-intensity neutrino beam from the J-PARC accelerator targeting a Near Detector suite, an Intermediate Water Cerenkov detector and an underground world-largest Water Cerenkov Far Detector, providing 0.19 Mt (fiducial mass) of ultra-pure water sensed by newly developed photo-sensors with 40%-equivalent photo-coverage, to perform Cerenkov ring reconstruction with a few MeV energy threshold. A second identical far detector may later be added in Korea.
Building on the legacy of Super-Kamiokande and T2K, the HK project will address a broad scientific program and substantially enhance our knowledge of both particle physics and astrophysics. Its objectives include precise measurements of neutrino oscillations and CP-asymmetry (with CPV discovery at 3 sigma for 76% of the phase space), solar neutrino astronomy, determination of supernova burst dynamics, detection of supernova relic neutrinos allowing to study supernova populations, searching for nucleon decay with improved sensitivity (10^{35} years for p->epi0 mode at 90%CL) and finding possible exotic phenomena.
Here we will present the project status and milestones, from the beginning of construction in 2020 towards the commissioning in 2027.

Speaker: Dr Federico Nova (Rutherford Appleton Laboratory)
• 17:00
Results and future perspectives of Borexino 30m

The Borexino liquid scintillator neutrino observatory is devoted to perform high-precision neutrino observations: the study of solar neutrinos is the primary goal of the experiment. The exceptional radiopurity together with the good energy resolution (5% at 1 MeV) put Borexino in the unique situation of being able to validate the MSW-LMA oscillation paradigm across the full solar energy range. A comprehensive study of the pp-chain neutrinos was recently released: this new study reports the direct measurements of pp, 7Be and pep neutrino fluxes with the highest precision ever achieved (down to ~2.8% in the 7Be component), the 8B with the lowest energy threshold, the best limit on CNO neutrinos and the first Borexino limit on hep neutrinos. The present talk shows the new results based on the full 10 years data sample and, in particular, on the more radiopure Phase-2 data, taken after the detector purification campaigns in 2010-11 and the perspectives for the final stage of the solar program. The talk will be concluded reporting the latest news on the detection of geoneutrinos with Borexino and the analysis techniques applied.

Speaker: Dr Alessio Caminata (INFN Genoa)
• 19:00 00:00
Conference Dinner 5h
• Friday, 28 February
• 09:00 11:00
Invited Talks Main Venue

#### Main Venue

• 09:00
Title to be confirmed 30m
Speaker: Naftali Auerbach
• 09:30
Constraining electron-capture rates with data from charge-exchange experiments 30m

Charge-exchange reactions have been used for a long time to extract Gamow-Teller transition strengths for a variety of applications in nuclear structure physics, nuclear astrophysics, and neutrino physics. Over the past few years, a dedicated effort has been made to constrain the nuclear structure calculations that are used to estimate electron-capture rates of importance for the late evolution of core-collapse supernovae, in particular in the N=50 region above Nickel-78. This effort involved (t,3He) experiments on Strontium-88, Krypton-86, and Niobium-93. The experimental work was combined with the development of a weak-rate library for astrophysical simulations and one-dimensional sensitivity studies of supernovae and their multi-messenger signals to uncertainties in electron-capture rates using that library. This presentation is an overview of these efforts, which involved a close collaboration between experimentalists and nuclear and astrophysical theorists.

Speaker: Remco Zegers (MSU)
• 10:00
Title to be confirmed 30m
Speaker: Peter von Neumann-Cosel (Institut fuer Kernphysik, Technische Universitaet Darmstadt)
• 10:30
Study of kinematic factors in double-beta decay 30m

S. Stoica,
International Centre for Advanced Training and Research in Physics and
Horia Hulubei National Institute of Physics and Nuclear Engineering,
P.O. Box MG12, 077125 Bucharest-Magurele, Romania

Until the recent past not to much importance was given to the kinematic factors related to the double-beta decay, i.e. the phase space factors, electronic spectra and angular correlations between the emitted electrons. The reason was largely because on the one side they were considered to be calculated/predicted with enough precision (in comparison for example with the nuclear matrix elements) and, on the other side, the experimental measurements had not reached a sufficient degree of accuracy to be able to distinguish fine details of them. This situation is changing now. A detailed analysis of the DBD electron spectra and angular correlations can provide us with useful information on transitions to excited states, on decay modes and mechanisms contributing to neutrinoless DBD and, very recently on possible effects of Lorentz symmetry violation in the neutrino sector.
In my presentation I will give first a short review about the challenges in computation of the space phase factors, electron spectra and electron angular correlations. Then, I refer to the analysis of observable effects of Lorentz violation (LV) in two-neutrino DBD in the framework of the Standard Model Extension (SME) and I present a comparison between the methods of calculation the summed electron spectra including the deviations due to LV associated to the like-time component of the so-called countershaded operator.
Finally, I show that our predictions regarding electronic spectra correlated with their precise measurements that are currently being done in DBD experiments (like EXO-2000, SuperNEMO, etc.) for searching LV effects, can improve with up to 30% the actual upper limits of the (ä)3of coefficient that governs the LV contribution.

References
J. S. Diaz, Phys. Rev. D 89, 036002 (2014).
J. Kotila and F. Iachello, Phys. Rev. C 85, 034314 (2012).
S. Stoica and M. Mirea, Phys. Rev. C88, 037303 (2013).
M. Mirea, T. Pahomi, and S. Stoica, Rom. Rep. Phys.67, 872 (2015).
S. Stoica, MEDEX’19, Prague, May 28, 2019.
S. Stoica and M. Mirea, Phase space factors for double-beta decay, Frontiers in Physics, ID 436288, 2019.

Speaker: Prof. Sabin Stoica (International Centre for Advanced Training and Research in Physics)
• 11:00 11:30
Coffee/Tea Break 30m
• 11:30 13:30
Contributed Talks Main Venue and Parallel Venue

#### Main Venue and Parallel Venue

• 11:30
Implications of new theoretical calculations on reactor antineutrino and gallium anomalies 20m Parallel Venue

#### Parallel Venue

The reactor antineutrino and gallium anomalies have been long unexplained. Possible explanations for both of these anomalies include new physics, such as the existence of one or more eV-scale sterile neutrino [Ga15]. However, the previous theoretical calculations, which do not replicate the experimental results, rely on many simplifying approximations [Ba97,Ha19].

In the reactor-antineutrino analysis the beta decays contributing to the cumulative electron spectrum are usually assumed to have allowed spectral shapes. However, many of these decays are actually first-forbidden. Moreover, these decays dominate the experimentally observable region. In some cases, like in the case of the ground-state-to-ground-state decay of $^{140}\rm Cs$ (see figure), this is found to be a rather poor approximation. Based on the recent results, the use of this allowed approximation can at least partially explain the so called reactor antineurtino anomaly.

Our new large-scale shell model calculations regarding the neutrino-nucleus scattering cross section off $^{71}\rm Ga$ shows no statistical difference to the experimental results of GALLEX and SAGE experiments. Conflict between charge-exchange BGTs and the neutrino-nucleus cross sections can to some extent be explained by destructive interference between Gamow-Teller and tensor contributions. A Bayesian approach to estimating the significance of the gallium anomaly is discussed.

[Ga15] S. Gariazzo, C. Giunti, M. Laveder, Y. F. Li, and
E. M. Zavanin, J. Phys. G: Nucl. Part. Phys. 43, 033001
(2015).

[Ba97] J. N. Bahcall Phys. Rev. C 56, 3391 (1997).

[Ha19] L. Hayen, J. Kostensalo, N. Severijns, and J. Suhonen
Phys. Rev. C 99, 031301(R) (2019).

Speaker: Joel Kostensalo (University of Jyvaskyla, Finland)
• 11:30
Non-standard mechanisms of neutrinoless double beta decay 20m Main Venue

#### Main Venue

Understanding the origin of lepton number violation is one of the major questions in physics today. Neutrinoless double beta decay provides a way in which this violation can be tested. Furthertmore, neutrinoless double beta decay can significantly help to shed light on the issue of nonzero neutrino mass, as the observation of this lepton-number-violating process would imply that neutrinos are Majorana particles. However, the underlying interaction does not have to be as simple as the standard neutrino mass mechanism. Recently, we have derived the form of hadronic and leptonic matrix elements for all possible short-range and long-range mechanisms of neutrinoless double beta decay. With these, we have calculated the numerical values of the nuclear matrix elements (NME) and phase space factors (PSF) by making use of the microscopic interacting boson model (IBM-2) for NMEs and of exact Dirac wave functions for the PSFs. The derived angular correlations of the emitted electrons show that distinction between different models of non-standard mechanisms, as well as standard mass mechanism, could be experimentally observable.

Speaker: Jenni Kotila (University of Jyvaskyla)
• 11:50
Revealing the Effect of Individual Fission Products in the Antineutrino Spectra from Nuclear Reactors 20m Parallel Venue

#### Parallel Venue

The Inverse Beta Decay antineutrino spectrum generated by nuclear reactors is calculated using the summation methods with the highest fidelity nuclear databases to date to understand deviations from the smooth Huber-Mueller model due to the decay of individual fission products. Several numerical methods were explored, and concluded that plotting the ratio of two adjacent spectra points can effectively reveal these deviations. We obtain that for binning energies of 0.1 MeV or lower, abrupt changes in the spectra due to the jagged nature of the individual antineutrino spectra could be observed for highly precise experiments. Surprisingly, our calculations also reveal a peak-like feature in the adjacent points ratio plot at 4.5 MeV even with a 0.25 MeV binning interval, which we find is present in the IBD spectrum published by Daya Bay in 2016 as well as the RENO spectrum published in 2018. We show that this 4.5 MeV feature is caused by the contributions of just four fission products, 95Y, 98,101Nb and 102Tc. This would be the first evidence of the decay of a few fission products in the IBD antineutrino spectrum from a nuclear reactor. The same technique is applied to the electron spectra measured at ILL, which allows us to additionally identify 96Y and 92Rb. The significance of this finding for short baseline experiments will be discussed.

Speaker: Dr Alejandro Sonzogni (Brookhaven National Laboratory)
• 11:50
Theoretical description of half-lives and electron spectra for higher order forbidden non-unique $\beta$ decays 20m Main Venue

#### Main Venue

Theoretical description of half-lives and electron spectra for higher order forbidden non-unique $\beta$ decays

Anil Kumar and Praveen C. Srivastava

Department of Physics, Indian Institute of Technology Roorkee,
Roorkee 247 667, India

In this work we have calculated log$ft$ and half-lives values of the higher order forbidden $\beta$-decays for selected nuclei [for e.g. $^{87}$Rb($3/2^-$) $\rightarrow$ $^{87}$Sr($9/2^+$)] in the framework of the nuclear shell model [1-3]. In the present study, we have included next-to-leading-order terms [4-6] in the shape functions to see their effect in the calculated half-lives and $\beta$ (or electron) spectra. The role of effective value of axial-vector coupling constant ($g_A$) in half-lives and $\beta$ spectra for higher-forbidden beta decay are very important. The $\beta^-$-spectrum of the fourth-forbidden non-unique decays of $^{113}$Cd and $^{115}$In strongly depends on the effective value of $g_A$ [4,7]. In our study we will report the spectrum-shape method (SSM) for electron spectra with the effective value of $g_A$. With the SSM, it is possible to extract information of effective value of the weak coupling constant by comparing the theoretical and experimental $\beta$ electron spectra of forbidden non-unique $\beta$-decays.

[1] H. Behrens and W. Bühring, Electron Radial Wave Functions
and Nuclear Beta-decay (Clarendon Press, Oxford, 1982).

[2] H. F. Schopper, Weak Interactions and Nuclear Beta Decay
(North-Holland, Amsterdam, 1966).

[3] J. Suhonen, From Nucleons to Nucleus: Concepts of Microscopic
Nuclear Theory (Springer, Berlin, 2007).

[4] M. Haaranen, J. Kotila and J. Suhonen, Spectrum-shape method and the next-to-leading-order terms of $\beta$-decays shape factor, Phys. Rev. C {\bf 95}, 024327 (2017).

[5] M.Haaranen, P. C. Srivastava and J. Suhonen, Forbidden nonunique $\beta$ decays and effective values of coupling constants, Phys. Rev. C {\bf 93}, 034308 (2016).

[6] J. Kostensalo, M. Haaranen, and J. Suhonen, Electron spectra in forbidden $\beta$ decays and the quenching of the weak axial-vector coupling constant $g_A$, Phys. Rev. C {\bf 95}, 044313 (2017).

[7] M. T. Mustonen, M. Aunola, and J. Suhonen, Theoretical description of the fourth-forbidden non-unique $\beta$ decays of $^{113}$Cd and $^{115}$In, Phys. Rev. C {\bf 73},
054301 (2006).

Speaker: Mr Anil Kumar (Indian Institute of Technology, Roorkee, India)
• 12:10
New limits on double beta processes in $^{106}$Cd 20m Main Venue

#### Main Venue

By comparing rates of neutrinoless double positron emission and electron capture with positron emission one could distinguish mechanism (due to light neutrino exchange or right-handed currents admixture in the weak interaction) of the neutrinoless double beta “minus” decay when observed. However, even the allowed two-neutrino mode of electron capture with positron emission is not observed yet. The nuclide $^{106}$Cd is a promising candidate forthe experimental investigations of the double beta “plus”decays (double electron capture, electron capture with positron emission and double positron emission) due to its high energy release 2775.39(10) keV and relatively high isotopic abundance 1.245(22)%. An experiment to search for double beta processes in $^{106}$Cd is in progress with the help of $^{106}$CdWO$_4$ crystal scintillator (enriched in $^{106}$Cd to 66%) in coincidence with two large volume CdWO$_4$ scintillation detectors in close geometry at the Gran Sasso Underground Laboratory. The sensitivity of the experiment is approaching the theoretical predictions for the double beta processes in $^{106}$Cd at a level of 10$^{20}–10^{22}$ yr that corresponds to the most sensitive double beta-plus experiments. The new limits on different modes and channels of $^{106}$Cd were set.

Speaker: Oksana Polishchuk (Institute for Nuclear Research)
• 12:10
Updated Summation Method Model and New Prediction for the Reactor Antineutrino Flux and Energy Spectrum 20m Parallel Venue

#### Parallel Venue

The accurate determination of reactor antineutrino spectra is still a challenge. In 2017 the Daya Bay collaboration has released a measurement of the evolution of the antineutrino flux with the fuel content of the reactor [1]. The observed deficit of the flux compared with the predictions of the conversion model was quasi totally explained by the data arising from the fissions of 235U while the part dominated by the fissions of 239Pu was in good agreement with the model. The distortion of the measured antineutrino energy spectrum at reactors in the 5 to 7 MeV range in comparison with the conversion model (shape anomaly) is not yet understood as well. The understanding of the underlying components of the antineutrino spectrum is possible using the nuclear beta decay data and the fission yields. This computation method, called the summation method [2], was re-developed in 2011 in order to predict reactor antineutrino spectra from any fuel under any irradiation condition without restriction of the antineutrino energy range. It was shown that the Pandemonium effect [3] affects the evaluated nuclear databases containing the required beta decay data. In [4] new Total Absorption Gamma-ray Spectroscopy (TAGS) results revealed to have a major impact on the antineutrino spectral shape. Since then the Nantes-Valencia collaboration has carried out two experimental campaigns during the last decade at the University of Jyväskylä, Finland, measuring a large set of data in order to improve the quality of the predictions of the summation method [5]. The summation model of [3] has been updated using the most recent evaluated beta decay databases and the TAGS measurements performed by our collaboration during the last decade [5] have been included in a new summation calculation. The impact of the TAGS results for these 15 nuclei on the detected antineutrino flux and on the energy spectrum will be shown [6]. These studies give an indication of the improvement of the quality of the nuclear data since 2011 and some hints about the effort that still needs to be done. The resulting detected antineutrino spectrum and flux has been compared without any renormalization with that obtained by the Daya Bay experiment showing a remaining difference in flux of only 1.9%, that should be further reduced with the inclusion of more Pandemonium free data in the calculation.
[1] F. P. An et al. (Daya Bay Collaboration), Phys. Rev. Lett. 118, 251801 (2017) and APS Viewpoint by M. Fallot.
[2] T. A. Mueller et al., Phys. Rev. C 83, 054615 (2011).
[3] J. C. Hardy et. al., Phys. Lett. B 71, 307 (1977)
[4] M. Fallot et al., Phys. Rev. Lett. 109 , 202504 (2012).
[5] A.-A. Zakari-Issoufou et al., Phys. Rev. Lett. 115 , 102503 (2015). J.L. Tain et al., Phys. Rev. Lett. 115, 062502. E. Valencia et al., Phys. Rev. C 95, 024320 (2017). S. Rice et al., Phys. Rev. C 96, (2017) 014320. V. Guadilla et al., Phys. Rev. Lett. 122, (2019) 042502.
[6] M. Estienne et al., Phys. Rev. Lett. 123, 022502 (2019).

Speaker: Dr Muriel Fallot (Subatech)
• 12:30
Study of $^{150}$Nd 2$\beta$ decay to the $0_1^+$ excited level of $^{150}$Sm 20m Main Venue

#### Main Venue

The $^{150}$Nd nuclide is one of the most promising ones to search for double beta decay among the 35 naturally occurring double beta isotopes because of the high energy release: 3371.38(20) keV, and of the comparatively high isotopic abundance: 5.638(28)%. The 2$\beta$ transition to the 740.5 keV $0_1^+$ excited level of $^{150}$Sm was observed in few experiments with half-lives in a wide range $(7 – 14)\times10^{19}$ y. The investigation of this decay is performed at the Gran Sasso underground laboratory (Italy) with a highly purified 2.381-kg Nd$_2$O$_3$ sample in the low-background setup with 4 HP Ge detectors ($\approx$225 cm$^3$ each), mounted in one cryostat. Two gamma-quanta with energies 334.0 keV and 406.5 keV emitted after the deexcitation of the $0_1^+$ excited level of $^{150}$Sm have been observed in the coincidence spectra accumulated over 25947 h giving the preliminary half-life value of the $^{150}$Nd relatively to the decay searched for: $T1/2=[6.9_{-1.9}^{+4.0}$(stat)$\pm1.1$(syst)$]\times10^{19}$ y. The experiment is in progress in order to improve the half-life value accuracy.

Speaker: Dmytro Kasperovych (Institute for Nuclear Research, Kyiv, Ukraine)
• 12:30
Total absorption measurements of the beta decay of relevant contributors to the antineutrino spectrum from reactors 20m Parallel Venue

#### Parallel Venue

Total absorption spectroscopy is presently the most reliable technique that provides beta
decay transition probabilities free from the Pandemonium systematic error [1-3]. In this
contribution we will present recent results from the work performed by our
collaboration employing this technique, which is relevant for reactor applications and in
particular for the prediction of the antineutrino spectrum in reactors. The measurements
have been performed at the University of Jyväskylä IGISOL IV Facility [4] using trapassisted
spectroscopy that provided radioactive beams of very high isotopic purity [5]
and in certain cases has allowed us to disentangle beta decaying isomers.
These measurements have provided beta decay data that are a key ingredient in an
updated antineutrino summation model [6] that presently provides the best description
of the measured spectra by the Daya Bay collaboration. In this contribution results
coming from our latest experiments will be presented [7-10].
[1] J. C. Hardy et. al., Phys. Lett. B 71, 307 (1977)
[2] B. Rubio et al., Journal of Physics G: Nuclear and Particle Physics 31, S1477
(2005).
[3] A. Algora, B. Rubio and J. L. Tain, Nuclear Physics News, 28, 12 (2018)
[4] I. D. Moore et al., Nucl. Instrum. and Methods B 317,208 (2013)
[5] T. Eronen et al., Eur. Phys. J. A 48, 46 (2012)
[6] M. Estienne et al., Phys. Rev. Lett. 123, 022502 (2019).
[7] J. L. Tain et al., Phys. Rev. Lett. 115, 062502 (2015)
[8] E. Valencia et al., Phys. Rev. C 95, 024320 (2017)
[9] S. Rice et al., Phys. Rev. C 96, 014320 (2017)
[10] V. Guadilla, et al., Phys. Rev. Lett.
122, 042502 (2019)

Speaker: Alejandro Algora (IFIC (CSIC-Univ. of Valencia), Valencia, Spain)
• 12:50
Decay Characteristics of the Scissors Mode of 0νββ-Decay Partner Isotopes* 20m Main Venue

#### Main Venue

The search for neutrinoless double beta (0νββ) decay, a process only allowed if the neutrino were a Majorana particle, recently gained much attention with numerous experiments being dedicated to its observation. It would demonstrate lepto-genesis in the universe and allow the determination of the neutrino mass from its decay rate. However, to quantitatively extract the neutrino mass or estimate decay rates a nuclear matrix element (NME) is required, which has to be calculated using nuclear structure models. One of them is the Interacting Boson Model 2 (IBM-2), which will be discussed below. Those calculations can be difficult because many of the 0νββ-decay candidate nuclei lie in regions of the nuclear chart that feature shape coexistence, with the hypothesized 0νββ-decay mother nucleus ¹⁵⁰Nd and its daughter ¹⁵⁰Sm even being located in the region of a shape phase transition along their respective isotopic chains. In particular, the occurrence of shape coexistence may lead to a significant population of an excited 0⁺ state in 0νββ decay. To improve 0νββ-NME calculations for ¹⁵⁰Nd and ¹⁵⁰Sm within the IBM-2 information on its so-called Majorana interaction is needed. Therefore, new data on the decay characteristics of the scissors mode of these nuclei was recently taken in nuclear resonance fluorescence experiments performed at the High Intensity γ-ray Source. The decay characteristics of the scissors mode are sensitive to the nuclear deformation and allow inducing constraints on model parameters, especially the Majorana parameters of the IBM-2, in turn resulting in a more reliable prediction of the 0νββ-NME. Similar information has also been obtained for the 0νββ-partner nuclides ⁸²Se and ⁸²Kr. The experimental results and updated IBM-2 calculations will be presented and discussed.
*Supported by the DFG through the research grant SFB 1245 and by the State of Hesse under the grant “Nuclear Photonics” within the LOEWE program.

Speaker: Mr Kleemann Jörn (AG Pietralla Institut für Kernphysik Technische Universität Darmstadt)
• 12:50
The search for eV sterile neutrinos with the STEREO experiment 20m Parallel Venue

#### Parallel Venue

In the last decade, two unsolved anomalies have appeared from the study of reactor neutrinos: one related to the neutrino spectral shape, and another to the absolute neutrino flux. The second one, known as the Reactor Antineutrino Anomaly, presents a deficit in the observed flux compared to the expected one that could point to the existence of a light sterile neutrino in the eV range participating in the oscillation phenomena.
The STEREO experiment is a short baseline reactor antineutrino experiment trying to test the existence of those sterile neutrinos. This experiment, taking data since the end of 2016, measures the antineutrino energy spectrum from the compact core of the research reactor of the Institut Laue-Langevin (Grenoble, France) operated with highly enriched U-235 fuel. Covering baselines between 9 and 11m with a segmented neutrino target, STEREO can study the rate of neutrino interactions and compare it among cells to test oscillation hypotheses at different distances from the source. STEREO can also measure the absolute neutrino flux and spectral shape emitted from a pure U-235 core.
Neutrino data from 179 (235) days of reactor turned on (off) have been analyzed, showing compatibility with the null oscillation hypothesis and rejecting the best fit point of the Reactor Antineutrino Anomaly at 99.8% C.L. In this talk, these results together with the latest improvements in the description of the detector models and the background treatment are reported, providing a crucial input in the search for sterile neutrinos.

Speaker: Ms Helena Almazan (Max-Planck-Institut fuer Kernphysik)
• 13:10
Analysis of two-proton transfer in the 40Ca(18O,Ne)38Ar and 116Cd(20Ne,18O)118Sn reactions 20m Main Venue

#### Main Venue

We analysed the angular distribution of two-proton pickup transfer for the 40Ca(18O,20Ne)38Ar reaction at 270 MeV incident energy. The coupled reaction channel (CRC) and coupled channel Born approximations (CCBA) methods were considered in the theoretical calculations to obtain the two-proton transfer angular distributions, in which the results have reproduced very well the experimental data. In addition, we also analysed the two-proton stripping transfer reaction corre- sponding to the 116Cd(20Ne,18 O)118Sn, at 306 MeV bombarding energy, for which the integrated cross section for the final channels 18O gs(0+) +118 Sn gs(0+) and 18O gs(0+) +118 Sn 1.23(2+) were measured. The data were quite well described by the theoretical results. The one- and two-proton spectroscopic amplitudes were derived from the shell model calculations. In this work, we have discussed the role of the paring correlations during the transfer process to populate the final channels in the present reactions. Besides, once these reactions might strongly compete with the double charge exchange reaction, like 40Ca(18O,18Ne)40Ar [1] and 116Cd(20Ne,20O)116 Sn [2], is extremely important to be confident with respect to the prediction of transfer cross section mainly for many reactions for which there is no experimental information that might compete with double charge exchange reaction. This measurement of the double charge exchange cross sections for different systems is the main objective of the NUMEN project.

[1] F. Cappuzzello et al., Eur. Phys. J. A 51, 145 (2015).

[2] F. Cappuzzello et al., Eur. Phys. J. A 54, 72 (2018)

Speaker: Jesus Lubian Rios (Federal Fluminense University)
• 13:10
Nuclear Structure Decay Studies for Reactor Antineutrino Physics 20m Parallel Venue

#### Parallel Venue

There have been two intriguing and unresolved puzzles surrounding recent measurements of reactor antineutrino spectrum in comparison with various calculated spectra, namely a deficient in the total number of measured antineutrinos and an excess of antineutrinos for energies from 5-7 MeV. While these observations could point to new physics, the beta-decay properties of fission fragments used as inputs to calculate the spectrum need to be fully understood before any solid conclusion could be reached. Particularly, with currently available data, the contribution of the decay of a few out of more than 800 total fission fragments is expected to be much more significant than the others to the energy region where the excess of antineutrinos is presented. These key isotopes include Rb-92, Cs-142, La-142 and Cs-141, which could be isotopically purified by the CARIBU facility at Argonne National Laboratory. Using the modern state-of-art gamma-ray spectrometers such as Gammasphere, we were able to study the decay properties of these purified isotopes in great detail, and to expand their decay schemes extensively. The results of these new measurements will be presented and their impact on reactor antineutrino calculations will be discussed.

Speaker: Dr Shaofei Zhu (Brookhaven National Laboratory)
• 13:30 14:00
End of talks. Move to buses. 30m
• 14:00 15:15
Bus drive to iThemba LABS (packed lunch provided on the bus) 1h 15m
• 15:30 17:30
iThemba LABS tour 2h
• 18:00 18:30
Student Prizes and Closing Remarks 30m
• 18:30 21:00
iThemba LABS braai 2h 30m
• 21:00 22:30
Bus to Arabella 1h 30m