Cross sections of solar neutrino capture by 127I nuclei and Gamow Teller resonances

TL;DR

This paper investigates the solar neutrino capture cross-section of 127I nuclei, emphasizing the role of Gamow-Teller resonances and their impact on isotope formation, with implications for detecting high-energy solar neutrinos.

Contribution

It provides a detailed analysis of resonance effects on neutrino capture cross-sections in 127I, including the influence of various Gamow-Teller resonances and their impact on isotope ratios.

Findings

High-lying resonances significantly affect the energy dependence of the cross-section.

The 126Xe/127Xe isotope ratio can serve as an indicator of high-energy boron neutrinos.

Uncertainties in Fermi-function calculations are discussed.

Abstract

Solar neutrino capture cross-section by 127I nucleus has been studied with taking into account the influence of the resonance structure of the nuclear strength function S(E). Three types of isobaric resonances: giant Gamow-Teller, analog resonance and low-lying Gamow-Teller pigmy resonances has been investigated on the framework of self-consistent theory of finite Fermi systems. The calculations have been performed considering the resonance structure of the charge-exchange strength function S(E). We analyze the effect of each resonance on the energy dependence of the cross-section. It has been shown that all high-lying resonances should be considered. Neutron emission process for high energy nuclear excitation leads to formation 126Xe isotope. We evaluate contribution from various sources of solar neutrinos to the 126Xe/127Xe isotopes ratio formed by energetic neutrinos. 126Xe/127Xe isotope ratio could be an indicator of high-energy boron neutrinos in the solar spectrum. We also discuss the uncertainties in the often used Fermi-functions calculations.