双室热中子透射法绝对$\rm ^3$ He偏振测量
Absolute $\rm ^3$He polarimetry for a double-chambered cell using transmission of thermal neutrons
摘要：
提出了一种基于热中子透射的双室He绝对偏振测量方法--$^3$ He偏振测量法。该方法利用了$^3$ He核具有大的吸收截面和对热中子的自旋依赖性的事实。该单元具有泵送室和靶室。极化$^3$ He气体通过SEOP在泵室中产生，然后扩散到靶室中。通过比较极化靶和非极化靶的中子透射率，确定了靶室中$^3$ He的极化。测量在RIKEN加速器驱动紧凑型中子源上进行。测定了靶室中的$^3$ He极化，统计误差为1.8%，系统不确定度为0.6%。该方法可用于研究核力中的少核子散射自旋观测量的高精度数据。
英文摘要：
We present an absolute $^3$He polarimetry method based on thermal neutron transmission for a double-chambered cell. This method utilizes the fact that a $^3$He nucleus has a large absorption cross section and a spin dependence for thermal neutrons. The cell had a pumping chamber and a target chamber. Polarized $^3$He gas was produced in the pumping chamber by SEOP and then diffused into the target chamber. The $^3$He polarization in the target chamber was determined by comparing the neutron transmissions with the polarized and unpolarized targets. The measurement was performed at the RIKEN Accelerator-Driven Compact Neutron Source. The $^3$He polarization in the target chamber was determined with a statistical error of 1.8% and systematic uncertainty of 0.6%. This method can be used to obtain high-precision data of spin observables in few-nucleon scattering for the investigation of nuclear forces.
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