BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Study of kinematic factors in double-beta decay
DTSTART;VALUE=DATE-TIME:20200228T102000Z
DTEND;VALUE=DATE-TIME:20200228T105000Z
DTSTAMP;VALUE=DATE-TIME:20260606T133717Z
UID:indico-contribution-1488@indico.tlabs.ac.za
DESCRIPTION:Speakers: Sabin Stoica (International Centre for Advanced Trai
 ning and Research in Physics)\nS. Stoica\,\nInternational Centre for Advan
 ced Training and Research in Physics and \nHoria Hulubei National Institut
 e of Physics and Nuclear Engineering\, \nP.O. Box MG12\, 077125 Bucharest-
 Magurele\, Romania\n\nUntil the recent past not to much importance was giv
 en to the kinematic factors related to the double-beta decay\, i.e. the ph
 ase space factors\, electronic spectra and angular correlations between th
 e emitted electrons. The reason was largely because on the one side they w
 ere considered to be calculated/predicted with enough precision (in compar
 ison for example with the nuclear matrix elements) and\, on the other side
 \, the experimental measurements had not reached a sufficient degree of ac
 curacy to be able to distinguish fine details of them. This situation is c
 hanging now. A detailed analysis of the DBD electron spectra and angular c
 orrelations can provide us with useful information on transitions to excit
 ed states\, on decay modes and mechanisms contributing to neutrinoless DBD
  and\, very recently on possible effects of Lorentz symmetry violation in 
 the neutrino sector. \nIn 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 th
 e framework of the Standard Model Extension (SME) and I present a comparis
 on between the methods of calculation the summed electron spectra includin
 g the deviations due to  LV associated to the like-time component of the s
 o-called countershaded operator.\nFinally\, I show that our predictions re
 garding 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 upp
 er limits of the  (ä)3of  coefficient  that governs the LV contribution. 
   \n\nReferences\nJ. S. Diaz\, Phys. Rev. D 89\, 036002 (2014).\nJ. Kotila
  and F. Iachello\, Phys. Rev. C 85\, 034314 (2012).\nS. Stoica and M. Mire
 a\, Phys. Rev. C88\, 037303 (2013). \nM. Mirea\, T. Pahomi\, and S. Stoica
 \, Rom. Rep. Phys.67\, 872 (2015).\nS. Stoica\, MEDEX’19\, Prague\, May 
 28\, 2019.\nS. Stoica and M. Mirea\, Phase space factors for double-beta d
 ecay\, Frontiers in Physics\, ID 436288\, 2019.\n\nhttps://indico.tlabs.ac
 .za/event/85/contributions/1488/
LOCATION:Main Venue
URL:https://indico.tlabs.ac.za/event/85/contributions/1488/
END:VEVENT
END:VCALENDAR