Improved determination of the β−ν¯e angular correlation coefficient a in free neutron decay with the aSPECT spectrometer
Improved determination of the β−ν¯e angular correlation coefficient a in free neutron decay with the aSPECT spectrometer
复制标题
使用 aSPECT 能谱仪改进自由中子衰变中 β-δe 角相关系数 a 的测定
DOI：
10.1103/physrevc.101.055506
复制
发表时间：
2020
影响因子：
3.1
通讯作者：
Simson, M.
中科院分区：
文献类型：
--
作者：
Beck, M.;Ayala Guardia, F.;Borg, M.;Kahlenberg, J.;Muñoz Horta, R.;Schmidt, C.;Wunderle, A.;Heil, W.;Maisonobe, R.;Simson, M.
我们报告了在实验中对自由中子衰变中电子-反中微子角相关系数的精确测量。该系数是从质子的反冲能谱中推断出来的，该能谱是由光谱仪使用带静电滤波器的磁绝热准直检测到的。数据来自2013年朗格万研究所100天的运行。考虑了系统误差的来源，并将其包含在最终结果中。我们得到了迄今为止最精确的中子系数测量值。由此，导出了轴向矢量与矢量耦合常数的比值。
We report on a precise measurement of the electron-antineutrino angular correlation (coefficient) in free neutron beta decay from theexperiment. Thecoefficient is inferred from the recoil energy spectrum of the protons which are detected inby thespectrometer using magnetic adiabatic collimation with an electrostatic filter. Data are presented from a 100-day run at the Institut Laue Langevin in 2013. The sources of systematic errors are considered and included in the final result. We obtainwhich is the most precise measurement of the neutroncoefficient to date. From this, the ratio of axial vector to vector coupling constants is derived giving.