Resonances in the solar neutrino capture cross-section for ${}^{76}Ge$ nuclei

Abstract

The calculation results of solar neutrino capture cross-section on the ${}^{76}Ge$ nucleus are presented. The charge-exchange strength function $S(E)$ was obtained from the experiment data in the ${}^{76}Ge{(}^{3}He,t{)}^{76}As$ reaction. The calculation includes the effect of the resonant structure of the strength function $S(E)$ on the calculated cross section $\sigma (E_{\nu })$. It is shown that only the giant Gamow-Teller resonance contributes about 20%, and an even greater contribution is made by excited states located lower in the continuous part of the spectrum. These contributions should be taken into account in the calculation of background events in experiments on double beta decay of the GERDA type (for example LEGEND).