用aCORN实验测量中子衰变电子-反中微子角关联
Measurement of the neutron decay electron-antineutrino angular correlation by the aCORN experiment
摘要：
aCORN实验测量中子衰变电子反中微子相关性（$a$ -系数），使用一种新的方法，基于不对称的质子飞行时间的事件，其中β电子和反冲质子被检测到延迟符合。我们报告了NIST中子研究中心第二次运行的数据分析和结果，在新的NG-C中子导管末端位置：$a = -0.10758 \pm 0.00136 (\mbox{stat}) \pm 0.00148 (\mbox{sys})$上使用高通量冷中子束。这与NG-6冷中子束上第一次aCORN运行的结果在不确定性范围内是一致的。结合两次aCORN运行，我们获得了$a = -0.10782 \pm 0.00124 (\mbox{stat}) \pm 0.00133 (\mbox{sys})$，其总体相对标准不确定度为1.7%。弱耦合常数比$λ= G_A/G_V$的相应结果为$λ= -1.2796\pm 0.0062$。
英文摘要：
The aCORN experiment measures the neutron decay electron-antineutrino correlation ($a$-coefficient) using a novel method based on an asymmetry in proton time-of-flight for events where the beta electron and recoil proton are detected in delayed coincidence. We report the data analysis and result from the second run at the NIST Center for Neutron Research, using the high-flux cold neutron beam on the new NG-C neutron guide end position: $a = -0.10758 \pm 0.00136 (\mbox{stat}) \pm 0.00148 (\mbox{sys})$. This is consistent within uncertainties with the result from the first aCORN run on the NG-6 cold neutron beam. Combining the two aCORN runs we obtain $a = -0.10782 \pm 0.00124 (\mbox{stat}) \pm 0.00133 (\mbox{sys})$, which has an overall relative standard uncertainty of 1.7 \%. The corresponding result for the ratio of weak coupling constants $λ= G_A/G_V$ is $λ= -1.2796\pm 0.0062$.
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