Nab: Measurement principles, apparatus and uncertainties
Nab: Measurement principles, apparatus and uncertainties
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DOI：
10.1016/j.nima.2009.07.065
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发表时间：
2009-12-01
影响因子：
1.4
通讯作者：
Young, G. R.
中科院分区：
文献类型：
--
作者：
Pocanic, Dinko;Alarcon, R.;Young, G. R.
NAB的合作将使用一种新型的电场/磁场光谱仪和探测器设计，在SNS的基本中子物理光束线中对电子-中微子关联参数a和中子β衰变中的Fierz干扰项b进行精确测量。这项实验的目标是以a/a为单位的10(-3)的精度水平，并将提供一个独立的测量波长=G(A)/G(V)，即核子的轴向矢量与矢量耦合常数的比率。NAB还计划首次测量中子衰变中的b，这将为张量弱耦合提供一个独立的极限。(C)2009爱思唯尔B.V.保留所有权利。
The Nab collaboration will perform a precise measurement of a, the electron-neutrino correlation parameter, and b, the Fierz interference term in neutron beta decay, in the Fundamental Neutron Physics Beamline at the SNS, using a novel electric/magnetic field spectrometer and detector design. The experiment is aiming at the 10(-3) accuracy level in Delta a/a, and will provide an independent measurement of lambda = G(A)/G(V), the ratio of axial-vector to vector coupling constants of the nucleon. Nab also plans to perform the first ever measurement of b in neutron decay, which will provide an independent limit on the tensor weak coupling. (C) 2009 Elsevier B.V. All rights reserved.