Abstract

The resonance structure of the charge-exchange strength function \(S(E)\) and its effect on the cross sections for solar-neutrino capture by \({}^{127}\)I nuclei are analyzed. Three types of isobaric resonances are studied within the self-consistent theory of finite Fermi systems. These are the giant Gamow–Teller resonance; the analog resonance; and the pygmy resonances, which lie lower. The capture cross section \(\sigma(E)\) for solar neutrinos incident to \({}^{127}\)I nuclei is calculated with allowance for the resonance structure of the strength function \(S(E)\), and the effect of each resonance on the energy dependence \(\sigma(E)\) is analyzed. It is shown that all high-lying charge-exchange resonances should be taken into account in calculating the cross section \(\sigma(E)\). The contributions of neutrinos of different origin to the structure of the cross section \(\sigma(E)\) are analyzed. In particular, the contribution of energetic neutrinos to the ratio of the \({}^{127}\)Xe and \({}^{126}\)Xe production rates is considered. The \({}^{126}\)Xe\(/^{127}\)Xe isotope ratio is an indicator of hard boron neutrinos in the solar spectrum.

中文翻译：

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高惯性共振对$$ {} ^ {\ mathbf {127}} $$ I核捕获太阳中微子截面的影响

摘要

分析了电荷交换强度函数\（S（E）\）的共振结构及其对通过\（{} ^ {127} \） I核捕获太阳中微子的截面的影响。在有限费米系统的自洽理论中研究了三种类型的等压共振。这就是巨大的Gamow-Teller共振。模拟谐振；和侏儒共鸣较低。计算入射到\（{} ^ {127} \） I原子核的太阳中微子的俘获截面\（\ sigma（E）\），并考虑了强度函数\（S（E）\）的共振结构，以及每个共振对能量依赖性\（\ sigma（E）\）的影响被分析。结果表明，在计算横截面\（\ sigma（E）\）时，应考虑所有高层电荷交换共振。分析了不同来源的中微子对截面\（\ sigma（E）\）的贡献。特别地，考虑了高能中微子对\（{} ^ {127} \） Xe与\（{} ^ {126} \） Xe生产率之比的贡献。的\（{} ^ {126} \）的Xe \（/ ^ {127} \）的Xe同位素比率是硬硼中微子的太阳光谱的指示器。