CROSS-SECTIONS FOR THE SOLAR NEUTRINOS CAPTURE AND CHARGE-EXCHANGE RESONANCES

<p>Investigation of charge-exchange resonances is important for calculating neutrino capturing cross-sections σ(E) of nuclei that can be used in neutrino detectors. Analog resonance, Gamow- Teller resonance (GTR) and three pigmy resonances are selected. Calculations were performed using the self-consistent theory of finite Fermi systems for Ga-71, Mo-98 and I-127. Even not accounting GTR gives a decrease of the σ(E) value more than 25%. Numbers of events in the interaction of solar neutrinos with these three nuclei calculated. It is shown that boron neutrinos make the main contribution and it is important to take into account all resonances.</p

SOLAR NEUTRINO CAPTURE CROSS-SECTION FOR Ge-76 NUCLEI

<p>In GERDA and LEGEND experiments, a solar neutrino absorption by Ge-76 isotope induces a background event which is indistinguishable from beta decay signal. We estimate cross sections for solar neutrino capture by Ge-76 nucleus for various excited states of daughter nucleus As-76. The Gamow-Teller transitions to the low-lying excited states and the Fermi transitions to the resonance states of this nucleus were taken into account. We demonstrate that these resonant excitations couldn't be neglected for calculating the interaction cross-section. Influence of these resonances enhances total count of neutrino-induced events by ∼ 40%.</p