Absolute $\rm ^3$He polarimetry for a double-chambered cell using transmission of thermal neutrons
| Autor: | Watanabe, A., Sekiguchi, K., Ino, T., Inoue, M., Nakai, S., Otake, Y., Taketani, A., Wakabayashi, Y. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.nima.2022.167486 |
| Popis: | 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. Comment: 15 pages, 7 figures |
| Databáze: | arXiv |
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