Final results for the neutron β -asymmetry parameter A 0 from the UCNA experiment
Final results for the neutron β -asymmetry parameter A 0 from the UCNA experiment
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UCNA 实验中子 β 不对称参数 A 0 的最终结果
DOI：
10.1051/epjconf/201921904004
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发表时间：
2019
影响因子：
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通讯作者：
Bowles, T.J.
中科院分区：
文献类型：
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作者：
Plaster, B.;Adamek, E.;Allgeier, B.;Anaya, J.;Back, H.O.;Bagdasarova, Y.;Berguno, D.B.;Blatnik, M.;Boissevain, J.G.;Bowles, T.J.
利用极化超冷中子（UCN）测量中子β不对称性参数A0，设计了UCNA实验。经由固体氘中的向下散射产生的UCN经由通过7 T磁场的传输而极化，并且然后被引导到1 T螺线管电子光谱仪，其中在位于光谱仪两端的电子检测器包中检测衰变电子。然后从两个探测器包中计数数量的不对称性中提取A0的值。我们总结了UCNA实验的所有结果，这些结果是在2007年、2008-2009年、2010年和2011-2013年的运行期间获得的，最终得出A0的精度结果为0.67%。
The UCNA experiment was designed to measure the neutron β-asymmetry parameterA0using polarized ultracold neutrons (UCN). UCN produced via downscattering in solid deuterium were polarized via transport through a 7 T magnetic field, and then directed to a 1 T solenoidal electron spectrometer, where the decay electrons were detected in electron detector packages located on the two ends of the spectrometer. A value forA0was then extracted from the asymmetry in the numbers of counts in the two detector packages. We summarize all of the results from the UCNA experiment, obtained during run periods in 2007, 2008–2009, 2010, and 2011–2013, which ultimately culminated in a 0.67% precision result forA0.