The Nab experiment: A precision measurement of unpolarized neutron beta decay

The Nab experiment: A precision measurement of unpolarized neutron beta decay
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Nab 实验:非极化中子 β 衰变的精确测量

DOI:
10.1051/epjconf/201921904002
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发表时间:
2019
影响因子:
--
通讯作者:
Borissenko, D.
Borissenko, D.
中科院分区:
--
文献类型:
--
作者:
Fry, J.;Alarcon, R.;Baeßler, S.;Balascuta, S.;Palos, L. Barrón;Bailey, T.;Bass, K.;Birge, N.;Blose, A.;Borissenko, D.

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中子β衰变是核物理中最基本的过程之一,它为揭示弱相互作用的细节提供了灵敏的手段。中子β衰变可以通过多重衰变关联来计算标准模型中轴向矢量与矢量耦合常数的比值λ =gA/gV。Na B实验将测量非极化自由中子β衰变中的电子-中微子相关参数,其精度为δa/a= 10− 3,菲耶兹干涉项为δB= 3 × 10− 3。这些结果,沿着更精确的中子寿命测量,旨在以δλ/λ = 0.03%的精度提供比率λ的独立测定,这将允许独立于核模型评估Vud和灵敏地测试CKM么正性。NAB利用一种新型的长不对称光谱仪,将衰变电子和质子引导到两个大面积硅探测器,以精确确定电子能量和质子飞行时间的质子动量估计。Nab谱仪正在橡树岭国家实验室的Sputterus中子源的基本中子物理束线上调试。我们提出了一个概述的纳布实验和最近更新的光谱仪,分析和系统的影响。
Neutron beta decay is one of the most fundamental processes in nuclear physics and provides sensitive means to uncover the details of the weak interaction. Neutron beta decay can evaluate the ratio of axial-vector to vector coupling constants in the standard model, λ =gA/gV, through multiple decay correlations. The Nab experiment will carry out measurements of the electron-neutrino correlation parameterawith a precision of δa/a= 10−3and the Fierz interference termbto δb= 3 × 10−3in unpolarized free neutron beta decay. These results, along with a more precise measurement of the neutron lifetime, aim to deliver an independent determination of the ratio λ with a precision of δλ/λ = 0.03% that will allow an evaluation ofVudand sensitively test CKM unitarity, independent of nuclear models. Nab utilizes a novel, long asymmetric spectrometer that guides the decay electron and proton to two large area silicon detectors in order to precisely determine the electron energy and an estimation of the proton momentum from the proton time of flight. The Nab spectrometer is being commissioned at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source at Oak Ridge National Lab. We present an overview of the Nab experiment and recent updates on the spectrometer, analysis, and systematic effects.
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