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arXiv · 2209.12484

Absolute $\rm ^3$He polarimetry for a double-chambered cell using transmission of thermal neutrons

A. Watanabe·K. Sekiguchi·T. Ino·M. Inoue·S. Nakai·Y. Otake·A. Taketani·Y. Wakabayashi
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Abstract

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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A. Watanabe, K. Sekiguchi, T. Ino, M. Inoue, S. Nakai, Y. Otake, A. Taketani, Y. Wakabayashi. 2022-09-26. Absolute $\rm ^3$He polarimetry for a double-chambered cell using transmission of thermal neutrons. https://doi.org/10.1016/j.nima.2022.167486

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