论文标题
使用偏振3HE细胞进行橡子实验的中子极化法
Neutron Polarimetry Using a Polarized 3He Cell for the aCORN Experiment
论文作者
论文摘要
NIST中子研究中心的NG-C光束线的中子极化是作为橡子中子β衰变实验的一部分测量的。记录了通过极化3HE自旋滤波器的中子传输，而绝热快速通道（AFP）核磁共振（NMR）则以八步序列逆转了3HE的极化方向，以解释漂移的漂移。中子透射对自旋滤网方向的依赖性用于计算中子极化。依赖时间的传输适合包括中子光谱的模型，而自旋松弛和AFP-NMR产生了3HE极化损失。发现NG-C光束线的极化为$ {\ MID} P_ \ MATHRM {N} {\ MID} \ LEQ 4 \ TIMES 10^{ - 4} $，具有90％的信心。
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.
