水中钆偶同位素的超新星中微子散射切伦科夫探测器
Supernova Neutrino Scattering off Gadolinium Even Isotopes in Water Cherenkov Detectors
摘要：
水中的中微子可以通过几种反应检测到。最重要的一个是逆β衰变$\barν_{e}+p \rightarrow n+e^{+}$。2.2MeV中子俘获自由质子的探测是非常困难的。钆（Gd）掺杂在水切伦科夫探测器的可行性，基本上减少了背景信号，提高了中微子检测的灵敏度。本文研究了超新星中微子与丰度最高的Gd偶同位素（A= 156，158，160）的荷电相互作用。利用测量的谱和准粒子无规相位近似计算了Gd同位素对超新星中微子的带电电流响应。通量平均截面考虑准热中微子光谱。
英文摘要：
Neutrinos in water can be detected thanks to several reactions. The most important one is the inverse beta decay $\barν_{e}+p \rightarrow n+e^{+}$ . The detection of 2.2 MeV from neutron capture on free protons is very difficult. The feasibility of Gadolinium (Gd) doping in water Cherenkov detectors essentially reduces background signals and enhances the sensitivity to neutrino detection. In this work, the supernova neutrino charged-current interactions with the most abundant Gd even isotopes (A=156,158 and 160) are studied. We use measured spectra and the quasiparticle random phase approximation to calculate the charged current response of Gd isotopes to supernova neutrinos. Flux-averaged cross sections are obtained considering quasi-thermal neutrino spectra.
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