论文标题
绝对$ \ rm ^3 $ HE使用热中子的传输，用于双腔电池
Absolute $\rm ^3$He polarimetry for a double-chambered cell using transmission of thermal neutrons
论文作者
论文摘要
我们提出了一种基于双重培训单元的热中子传输的绝对$^3 $ HE极化方法。该方法利用了这样一个事实，即$^3 $ HE核具有较大的吸收横截面和热中子的旋转依赖性。该单元有一个抽水室和一个目标室。偏振$^3 $ HE气体是由SEOP在抽水室中产生的，然后扩散到目标室中。目标腔中的$^3 $ HE极化是通过将中子传输与偏振和非极化目标进行比较来确定的。测量是在Riken Accelerator驱动的紧凑型中子源上进行的。 $^3 $ HE在目标室中的极化由统计误差为1.8％，系统不确定性为0.6％。该方法可用于获取几核散射中自旋可观察物的高精度数据，以研究核力量。
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.
