用有限狄拉克和(FDS)从相干弹性中微子-核散射(CEνNS)数据中解出低能反应堆中微子通量
Unfolding the low-energy reactor neutrino flux from CE$ν$NS data with a finite Dirac sum
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中文总结 AI 辅助
该研究提出有限狄拉克和(FDS)方法,用于从CEνNS数据中解出未测量的低能反应堆中微子通量,无需假设能谱参数形式,还将其与蒂霍诺夫正则化解褶法做了对比。
中文摘要 AI 辅助
我们提出一种分析相干弹性中微子-核散射(CEνNS)数据的新方法,以提取1.8 MeV逆β衰变阈值以下的反应堆反中微子能谱,该能谱目前尚未被测量。借鉴为直接暗物质探测开发的与晕无关的分析技术,我们展示了如何在不假设能谱的参数形式或平滑性先验的情况下,获得积分中微子通量的最佳拟合值和逐点置信带。我们的方法基于凸几何论证,将微分中微子率表示为狄拉克δ函数的线性组合——即有限狄拉克和(FDS),其项的最大数量由数据点的数量决定。我们将我们的“FDS方法”应用于低阈值锗探测器的模拟CEνNS数据,并与蒂霍诺夫正则化解褶法进行比较。
英文摘要
We present a novel method to analyze coherent elastic neutrino--nucleus scattering (CE$ν$NS) data to extract the reactor antineutrino spectrum below the inverse beta decay threshold of 1.8 MeV, where it remains unmeasured. Adapting halo-independent analysis techniques developed for direct dark matter detection, we show how to obtain a best-fit and a pointwise confidence band for the integrated neutrino flux, without assuming a parametric form or smoothness prior for the spectrum. In our approach, which follows from convex geometry arguments, the differential neutrino rate is written as a linear combination of Dirac delta functions -- a finite Dirac sum (FDS) -- with a maximum number of terms determined by the number of data points. We apply our ``FDS method'' to mock CE$ν$NS data for a low-threshold Ge detector and compare it with Tikhonov-regularized unfolding.