论文标题
通过橡子实验测量中子衰变电子 - 抗氨基酸角度相关性
Measurement of the neutron decay electron-antineutrino angular correlation by the aCORN experiment
论文作者
论文摘要
橡子实验测量了基于质子飞行器中不对称的新方法中的中子衰减电子 - 抗抗抗酸（$ a $ a $ a），以延迟同时检测到beta电子和后坐力质子的事件。我们使用新的NG-C中子指南终端位置上的高速畅通无阻的中子束在NIST中子研究中心进行了数据分析和第二次运行的结果：$ A = -0.10758 \ PM 0.00136（\ Mbox {stat}）\ pm 0.00148（\ mbox {sys {sys} {sys}）$。这在不确定性中是一致的，这是在NG-6冷中子束上首次运行的橡子量的结果。结合两个橡子运行，我们获得$ a = -0.10782 \ pm 0.00124（\ mbox {stat}）\ pm 0.00133（\ mbox {sys}）$，其总体相对标准不确定性为1.7 \％。弱耦合常数$λ= g_a/g_v $的相应结果为$λ= -1.2796 \ pm 0.0062 $。
The aCORN experiment measures the neutron decay electron-antineutrino correlation ($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 $λ= -1.2796\pm 0.0062$.
