Improved determination of the β − ν ¯ e angular correlation coefficient a in free neutron decay with the a SPECT spectrometer
Physical Review C(2020)
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$\pi$ 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 $|\lambda| = 1.2677(28)$.
更多查看译文
关键词
free neutron decay,angular correlation,<mmlmath xmlnsmml=http//wwww3org/1998/math/mathml><mmlmrow><mmlmi>β</mmlmi><mmlmtext>−</mmlmtext><mmlmsub><mmlmover><mmlmi>ν</mmlmi><mmlmo>¯</mmlmo></mmlmover><mmlmi>e</mmlmi></mmlmsub></mmlmrow></mmlmath>
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要