标题： 使用 Nab 确定无极中子衰变中的相关性 显示英文标题

标题： Using Nab to determine correlations in unpolarized neutron decay

摘要： 纳布实验将精确测量弱轴矢量和矢量耦合常数$\lambda=g_A/g_V$的比值，精度为$\delta\lambda/\lambda\sim3\times10^{-4}$，并在$\Delta b_F<10^{-3}$水平上搜索费尔兹项$b_F$。 纳布探测系统使用厚的、大面积的、分段的硅探测器，以非常精确地确定衰变质子的飞行时间和衰变电子的能量，并同时重建反中微子和电子动量之间的相关性。 需要对使用该探测系统影响时间与能量重建的系统效应有很好的理解。 为了探索这些效应，已经进行了系列的外部研究，包括在$\Delta b_F<10^{-2}$水平上使用 UCNA 光谱仪在$^{45}$钙的β衰变中搜索费尔兹项。 显示英文摘要

摘要： The Nab experiment will measure the ratio of the weak axial-vector and vector coupling constants $\lambda=g_A/g_V$ with precision $\delta\lambda/\lambda\sim3\times10^{-4}$ and search for a Fierz term $b_F$ at a level $\Delta b_F<10^{-3}$. The Nab detection system uses thick, large area, segmented silicon detectors to very precisely determine the decay proton's time of flight and the decay electron's energy in coincidence and reconstruct the correlation between the antineutrino and electron momenta. Excellent understanding of systematic effects affecting timing and energy reconstruction using this detection system are required. To explore these effects, a series of ex situ studies have been undertaken, including a search for a Fierz term at a less sensitive level of $\Delta b_F<10^{-2}$ in the beta decay of $^{45}$Ca using the UCNA spectrometer.