New capabilities of an iodine detector for solar neutrinos

This study has indicated that the resonance structure of the charge-exchange strength function $S(E)$ strongly affects the cross section for solar neutrino capture $\sigma(E)$ by the $^{127}\mathrm{I}$ nucleus. The effect of each resonance on the energy dependence of $\sigma(E)$ for an iodine detector has been analyzed. It has been shown that all high-lying charge-exchange resonances should be taken into account in the calculations of the cross section $\sigma(E)$, and the highest energy resonances in the strength function $S(E)$ determine the formation of the stable $^{126}\mathrm{Xe}$ isotope at the capture of a high-energy solar neutrino by the $^{127}\mathrm{I}$ nucleus and the subsequent neutron emission from the formed $^{127}\mathrm{Xe}$ isotope. The calculations with the inclusion of the neutron separation energy $S_n$ in the $^{127}\mathrm{Xe}$ nucleus show that the inclusion of the neutron separation energy $S_n$ reduces the neutrino capture rate, particularly for boron and hep neutrinos, and the $^{126}\mathrm{Xe}/^{127}\mathrm{Xe}$ isotope ratio is an indicator of these hard neutrinos. It has been found that the formation of the $^{126}\mathrm{Xe}$ isotope is accompanied by the emission of gamma-ray photons with a certain energy. It has been shown that the analysis of the $^{126}\mathrm{Xe}/^{127}\mathrm{Xe}$ isotope ratio in the formed xenon gas mixture and the detection of gamma emission in $^{126}\mathrm{Xe}$ open new capabilities of the iodine detector for the detection of solar neutrinos and make it possible to separate the important boron component of the solar spectrum.