Absolute $\rm ^3$He polarimetry for a double-chambered cell using transmission of thermal neutrons
Abstract
We present an absolute He polarimetry method based on thermal neutron transmission for a double-chambered cell. This method utilizes the fact that a 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 He gas was produced in the pumping chamber by SEOP and then diffused into the target chamber. The 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 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.
Keywords
Cite
@article{arxiv.2209.12484,
title = {Absolute $\rm ^3$He polarimetry for a double-chambered cell using transmission of thermal neutrons},
author = {A. Watanabe and K. Sekiguchi and T. Ino and M. Inoue and S. Nakai and Y. Otake and A. Taketani and Y. Wakabayashi},
journal= {arXiv preprint arXiv:2209.12484},
year = {2022}
}
Comments
15 pages, 7 figures