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arXiv 0810.0251nucl-exhep-exhep-ph
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Nab：测量原理、仪器与解释

Nab: Measurement Principles, Apparatus and Uncertainties

D. Pocanic, R. Alarcon, L. P. Alonzi, S. Baessler, S. Balascuta, J. D. Bowman, M. A. Bychkov, J. Byrne, J. R. Calarco, V. Cianciolo, C. Crawford, E. Frlez, M. T… 展开作者

D. Pocanic, R. Alarcon, L. P. Alonzi, S. Baessler, S. Balascuta, J. D. Bowman, M. A. Bychkov, J. Byrne, J. R. Calarco, V. Cianciolo, C. Crawford, E. Frlez, M. T. Gericke, G. L. Greene, R. K. Grzywacz, V. Gudkov, F. W. Hersman, A. Klein, J. Martin, S. A. Page, A. Palladino, S. I. Penttila, K. P. Rykaczewski, W. S. Wilburn, A. R. Young, G. R. Young

备注：
12 pages, 6 figures, 1 table, talk presented at the International Workshop on Particle Physics with Slow Neutrons, Grenoble, 29-31 May 2008; to appear in Nucl. Instrum. Meth. in Physics Research A
发表信息：
Nucl.Instrum.Meth.A611:211-215,2009
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摘要：

Nab合作将在SNS的基本中子物理光束线中使用新型电/磁场光谱仪和探测器设计对电子-中微子相关参数"a“和中子β衰变中的Fierz干扰项”b“进行精确测量。该实验的目标是（Δ a）/a的10^{-3}精度水平，并将提供核子轴矢比耦合常数λ = G_A/G_V的独立测量。Nab还计划进行有史以来第一次测量中子衰变中的'b'，这将提供对张量弱耦合的独立限制。

英文摘要：

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.

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