重新审视镓太阳中微子俘获截面
The Gallium Solar Neutrino Capture Cross Section Revisited
AI总结：
本文重新评估$^{71}$Ga太阳中微子俘获截面，修正激发态张量算符贡献并纳入电子俘获寿命及近阈值连续态等修正，使$^8$B和hep截面较Bahcall值总体提高约10%。
摘要：
来自经典GALLEX/GNO和SAGE实验的太阳中微子通量约束，继续影响着当代对中微子性质的全局分析。这些约束依赖于各种太阳源的中微子吸收截面。在近期更新$^{51}$Cr和$^{37}$Ar中微子源截面的工作之后，我们重新评估了$^{71}$Ga太阳中微子截面，重点关注跃迁到$^{71}$Ge激发态的贡献，同时也修订了基态跃迁，以纳入新的$^{71}$Ge电子俘获寿命测量结果和各种理论修正。激发态贡献传统上取自前角$(p,n)$截面。在此，我们针对约10%–20%的张量算符贡献修正了这一程序，该贡献会改变Gamow-Teller跃迁强度与$(p,n)$跃迁强度之间的关系。利用最先进的核壳模型计算来评估这一修正，我们发现它降低了$^8$B和hep中微子截面。然而，加入其他修正（包括来自发生辐射衰变的近阈值连续态的贡献）后，$^8$B和hep截面相对于Bahcall推荐值总体增加约10%。不确定性通过Monte Carlo模拟进行传播。
英文摘要：
Solar neutrino flux constraints from the legacy GALLEX/GNO and SAGE experiments continue to influence contemporary global analyses of neutrino properties. The constraints depend on the neutrino absorption cross sections for various solar sources. Following recent work updating the $^{51}$Cr and $^{37}$Ar neutrino source cross sections, we reevaluate the $^{71}$Ga solar neutrino cross sections, focusing on contributions from transitions to $^{71}$Ge excited states, but also revising the ground-state transition to take into account new $^{71}$Ge electron-capture lifetime measurements and various theory corrections. The excited-state contributions have been traditionally taken from forward-angle $(p,n)$ cross sections. Here we correct this procedure for the $\approx 10\%-20\%$ tensor operator contribution that alters the relationship between Gamow-Teller and $(p,n)$ transition strengths. Using state-of-the-art nuclear shell-model calculations to evaluate this correction, we find that it lowers the $^8$B and hep neutrino cross sections. However, the addition of other corrections, including contributions from near-threshold continuum states that radiatively decay, leads to an overall increase in the $^8$B and hep cross sections of $\approx 10\%$ relative to the values recommended by Bahcall. Uncertainties are propagated using Monte Carlo simulations.
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