Circular polarization measurement for individual gamma rays in capture reactions with intense pulsed neutrons

• Published in: The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2024-08, Vol.60 (8), Article 166
• Main Authors: Endo, Shunsuke, Abe, Ryota, Fujioka, Hiroyuki, Ino, Takashi, Iwamoto, Osamu, Iwamoto, Nobuyuki, Kawamura, Shiori, Kimura, Atsushi, Kitaguchi, Masaaki, Kobayashi, Ryuju, Nakamura, Shoji, Oku, Takayuki, Okudaira, Takuya, Okuizumi, Mao, Omer, Mohamed, Rovira, Gerard, Shima, Tatsushi, Shimizu, Hirohiko M., Shizuma, Toshiyuki, Taira, Yoshitaka, Takada, Shusuke, Takahashi, Shingo, Yoshikawa, Hiromoto, Yoshioka, Tamaki, Zen, Heishun
• Format: Article
• Language: English
• Subjects: Circular polarization; Elastic scattering; Gamma rays; Hadrons; Heavy Ions; Magnetic resonance; Neutrons; Nuclear capture; Nuclear Fusion; Nuclear Physics; Nuclear reactions; Parity; Particle and Nuclear Physics; Physics; Physics and Astronomy; Polarimeters; Polarization (spin alignment); Resonance scattering; Special Article – New Tools and Techniques
• ISSN: 1434-601X; 1434-6001; 1434-601X
• DOI: 10.1140/epja/s10050-024-01392-6

Measurements of circular polarization of γ -ray emitted from neutron capture reactions provide valuable information for nuclear physics studies. The spin and parity of excited states can be determined by measuring the circular polarization from polarized neutron capture reactions. Furthermore, the γ -ray circular polarization in a neutron capture resonance is crucial for studying the enhancement effect of parity nonconservation in compound nuclei. The γ -ray circular polarization can be measured using a polarimeter based on magnetic Compton scattering. A polarimeter was constructed, and its performance indicators were evaluated using a circularly polarized γ -ray beam. Finally, as a demonstration, the γ -ray circular polarization was measured in 32 S( n , γ ) 33 S reactions with polarized neutrons.