Nab实验：非极化中子β衰变的精密测量
核实验
2020-01-09 v3
摘要
中子β衰变是核物理中最基本的过程之一，并为揭示弱相互作用细节提供了灵敏手段。中子β衰变可通过多种衰变关联评估标准模型中轴矢量与矢量的耦合常数之比 。Nab实验将在非极化自由中子β衰变中以 的精度测量电子-中微子关联参数 ，并以 的精度测量Fierz干涉项 。这些结果连同更精密的中子寿命测量，旨在以 的精度独立确定比值 ，从而允许对 进行评估并灵敏检验CKM幺正性，且独立于核模型。Nab采用一种新颖的长不对称谱仪，将衰变电子与质子引导至两个大面积硅探测器，以精确确定电子能量并依据质子飞行时间估算质子动量。Nab谱仪正在橡树岭国家实验室的散裂中子源基本中子物理束线上进行调试。我们给出Nab实验的概述及谱仪、分析与系统效应的近期进展。
引用
@article{arxiv.1811.10047,
title = {The Nab Experiment: A Precision Measurement of Unpolarized Neutron Beta Decay},
author = {J. Fry and R. Alarcon and S. Baessler and S. Balascuta and L. Barron-Palos and T. Bailey and K. Bass and N. Birge and A. Blose and D. Borissenko and J. D. Bowman and L. J. Broussard and A. T. Bryant and J. Byrne and J. R. Calarco and J. Caylor and K. Chang and T. Chupp and T. V. Cianciolo and C. Crawford and X. Ding and M. Doyle and W. Fan and W. Farrar and N. Fomin and E. Frlez and M. T. Gericke and M. Gervais and F. Gluck and G. L. Greene and R. K. Grzywacz and V. Gudkov and J. Hamblen and C. Hayes and C. Hendrus and T. Ito and A. Jezghani and H. Li and M. Makela and N. Macsai and J. Mammei and R. Mammei and M. Martinez and D. G. Mathews and M. McCrea and P. McGaughey and C. D. McLaughlin and P. Mueller and D. van Petten and S. I. Penttila and D. E. Perryman and R. Picker and J. Pierce and D. Pocanic and Y. Qian and J. Ramsey and G. Randall and G. Riley and K. P. Rykaczewski and A. Salas-Bacci and S. Samiei and E. M. Scott and T. Shelton and S. K. Sjue and A. Smith and E. Smith and E. Stevens and J. Wexler and R. Whitehead and W. S. Wilburn and A. Young and B. Zeck},
journal= {arXiv preprint arXiv:1811.10047},
year = {2020}
}
备注
Presented at PPNS2018