Circular polarization measurement of γ-rays emitted from ³²S(n,γ)³³S reaction with polarized neutrons

¹ Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Ibaraki 319-1195, Japan.
² Nagoya University, Furocho, Chikusa-ku, Nagoya, Aichi 464-8062, Japan.
³ Tokyo Institute of Technology, 2-12 Ookayama, Meguro-ku, Tokyo 152-8511, Japan.
⁴ Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan.
⁵ Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan.
⁶ Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.
⁷ Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8576 Japan.
⁸ Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.

^* e-mail: endo.shunsuke@jaea.go.jp

Published online: 25 June 2025

Abstract

We aim to measure circular polarization of γ-rays emitted from neutron capture reactions with a pulsed neutron source for nuclear data and nuclear physics studies. A γ-ray polarimeter was developed to measure the circular polarization. One of performance indicators for polarimeter is an analyzing power known as efficiency in the polarization measurement. The analyzing power is necessary to convert the experimental results to circular polarization. Therefore, the analyzing power was evaluated using the neutron capture reactions of sulfur-32 at the neutron time-of-flight facility, and obtained to be (1.82 ± 0.28)% at 5.4-MeV γ-rays.