23-28 February 2020
Africa/Johannesburg timezone
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Calculation of the neutrino-nuclear reaction cross-sections for ๐‘ฎ๐’†๐Ÿ•๐Ÿ” nuclei and estimation of the solar neutrino background in the GERDA/LEGEND experiments.

28 Feb 2020, 09:40
Main Venue

Main Venue

Oral Solar models and detection of solar neutrinos Contributed Talks


Andrei Vyborov (Moscow Institute of Physics and Technology)


The work presents calculations of the neutrino-nuclear reaction cross-sections using the
example of the nucleus ๐บ๐‘’'( (๐บ๐‘’'( ๐œˆ, ๐‘’ ๐ด๐‘ '( ). In the structure of the nucleus, not only
discrete, but also continuous states formed due to the collective interaction of nucleons were
distinguished. In particular, the contribution of the Giant Gamow-Teller resonance and so-called
pygmy resonances in the capture rate of solar neutrinos was estimated (an increase of 25% to
50%, depending on the quenching parameter used).
Based on the obtained capture rate, a Monte Carlo simulation of the subsequent beta
decay of the nucleus ๐ด๐‘ '( (๐ด๐‘ '( โ†’ ๐‘†๐‘’'( + ๐‘’2 + ๐œˆ
+ ๐‘›๐›พ) was carried out for germanium
detectors in the GERDA experiment. Thus, the contribution of the background component due
to solar neutrinos was estimated, which, due to the small cross-sections of neutrino-nuclear
reactions, is practically unremovable, imposing confines on the sensitivity limit of the setup.
A similar assessment can be made for the upcoming LEGEND experiment taking into
account its geometry. Preliminary results suggest that BI of solar neutrinos are 1-2 orders of
magnitude lower than the predicted accuracy of the LEGEND experiment.

Primary author

Andrei Vyborov (Moscow Institute of Physics and Technology)

Presentation Materials