aCORN实验用极化~ 3 He池的中子极化测量
Neutron Polarimetry Using a Polarized 3He Cell for the aCORN Experiment
摘要：
NIST中子研究中心的NG-C束线的中子极化是作为aCORN中子β衰变实验的一部分测量的。记录了通过极化的3 He自旋过滤器单元的中子透射，同时绝热快通（AFP）核磁共振（NMR）以八步序列反转3 He的极化方向以解释漂移。利用中子透射率对自旋过滤器方向的依赖关系计算了中子极化。与时间相关的透射率被拟合到一个模型，该模型包括中子谱，以及来自自旋弛豫和AFP-NMR的3 He极化损失。发现NG-C光束线的偏振为${\mid}P_\mathrm{n}{\mid} \leq 4\times 10^{-4}$，置信度为90%。
英文摘要：
The neutron polarization of the NG-C beamline at the NIST Center for Neutron Research was measured as part of the aCORN neutron beta decay experiment. Neutron transmission through a polarized 3He spin filter cell was recorded while adiabatic fast passage (AFP) nuclear magnetic resonance (NMR) reversed the polarization direction of the 3He in an eight-step sequence to account for drifts. The dependence of the neutron transmission on the spin filter direction was used to calculate the neutron polarization. The time dependent transmission was fit to a model which included the neutron spectrum, and 3He polarization losses from spin relaxation and AFP-NMR. The polarization of the NG-C beamline was found to be ${\mid}P_\mathrm{n}{\mid} \leq 4\times 10^{-4}$ with 90 % confidence.
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