论文标题
模拟由于超新星中微子诱导的液体氙气检测器中中微子诱导的中子而引起的核后坐力的模拟
Simulation of Nuclear Recoils due to Supernova Neutrino-induced Neutrons in Liquid Xenon Detectors
论文作者
论文摘要
来自超新星（SN）爆发的中微子可以通过大规模液体XENON检测器中的连贯的弹性中微子核散射（CE $ν$ ns）过程引起可检测的核后坐力（NR）事件，该过程根据直接暗物质搜索而设计，取决于SN祖先质量和距离。在这里，我们表明，除了由于CE $ν$ ns过程引起的直接NR事件外，SN中微子还会由于中微子与异源核的非弹性相互作用产生的中子的弹性散射而引起其他核后坐力。我们发现，与单独的CE $ν$ ns流程相比，与CE $ν$ ns过程相比，超新星中微子引起的中微子诱导的中子（$ν$ i $ n $）可以显着修改Xenon NR频谱。此外，对于后坐力能量$ \ gtrsim20 $ kev，从（$ν$ i $ n $）事件获得了主要贡献。我们从数值上计算可观察的S1和S2信号，这是由于CE $ν$ ns和$ν$ i $ n $的过程的典型基于液体Xenon的检测器的过程，这考虑了中子在$ $ν$ i $ n $的情况下的多重散射效果S2 $ \ gtrsim $ 2300 PE，主要来自$ν$ i $ n $散射。
Neutrinos from supernova (SN) bursts can give rise to detectable number of nuclear recoil (NR) events through the coherent elastic neutrino-nucleus scattering (CE$ν$NS) process in large scale liquid xenon detectors designed for direct dark matter search, depending on the SN progenitor mass and distance. Here we show that in addition to the direct NR events due to CE$ν$NS process, the SN neutrinos can give rise to additional nuclear recoils due to the elastic scattering of neutrons produced through inelastic interaction of the neutrinos with the xenon nuclei. We find that the contribution of the supernova neutrino-induced neutrons ($ν$I$n$) can significantly modify the total xenon NR spectrum at large recoil energies compared to that expected from the CE$ν$NS process alone. Moreover, for recoil energies $\gtrsim20$ keV, dominant contribution is obtained from the ($ν$I$n$) events. We numerically calculate the observable S1 and S2 signals due to both CE$ν$NS and $ν$I$n$ processes for a typical liquid xenon based detector, accounting for the multiple scattering effects of the neutrons in the case of $ν$I$n$, and find that sufficiently large signal events, those with S1$\gtrsim$50 photo-electrons (PE) and S2$\gtrsim$2300 PE, come mainly from the $ν$I$n$ scatterings.
