用$a$ SPECT谱仪测定自由中子衰变中$β$ - $\overlineν_e$角相关系数$a$的改进
Improved determination of the $β$-$\overlineν_e$ angular correlation coefficient $a$ in free neutron decay with the $a$SPECT spectrometer
摘要：
本文报道了在$a$ SPECT实验中对自由中子β衰变中的电子-反中微子角关联（$a$系数）的精确测量。$a$系数是从质子的反冲能谱推断的，所述质子是由$a$ SPECT光谱仪使用带有静电过滤器的磁绝热准直在4 $π$中检测到的。数据来自2013年在劳厄朗之万研究所运行的100天。考虑了系统误差的来源，并将其包括在最终结果中。我们得到了迄今为止最精确的中子$a$系数的测量值$a = -0.10430(84)$。由此导出轴向矢量与矢量耦合常数之比，给出$|λ| = 1.2677(28)$。
英文摘要：
We report on a precise measurement of the electron-antineutrino angular correlation ($a$ coefficient) in free neutron beta-decay from the $a$SPECT experiment. The $a$ coefficient is inferred from the recoil energy spectrum of the protons which are detected in 4$π$ by the $a$SPECT spectrometer using magnetic adiabatic collimation with an electrostatic filter. Data are presented from a 100 days run at the Institut Laue Langevin in 2013. The sources of systematic errors are considered and included in the final result. We obtain $a = -0.10430(84)$ which is the most precise measurement of the neutron $a$ coefficient to date. From this, the ratio of axial-vector to vector coupling constants is derived giving $|λ| = 1.2677(28)$.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
