2026-01-23 理化学研究所
実験装置の概略図。²³⁸UビームとBe標的の衝突から作られた¹³²SnビームがBigRIPSスペクトロメータ中を輸送され、終端で固体水素標的に照射され陽子弾性散乱事象がRPS検出器群で測定される。
＜関連情報＞
- https://www.kyoto-u.ac.jp/ja/research-news/2026-01-23-6
- https://www.kyoto-u.ac.jp/sites/default/files/2026-01/web_2601_Zenihiro-815a2d3317e769c20b3564272c62c279.pdf
- https://academic.oup.com/ptep/advance-article/doi/10.1093/ptep/ptaf182/8416435
200 MeV/核子での陽子弾性散乱による 132 Sn の物質半径の初めての抽出 First Extraction of the Matter Radius of 132Sn via Proton Elastic Scattering at 200 MeV/nucleon
Y Hijikata,J Zenihiro,S Terashima,Y Matsuda,H Sakaguchi,P Arthuis,T Miyagi,S Ota,H Baba,S Chebotaryov
Progress of Theoretical and Experimental Physics Published:07 January 2026
DOI:https://doi.org/10.1093/ptep/ptaf182
Abstract
The angular distribution of the differential cross sections for proton elastic scattering from 132Sn at 196–210 MeV/nucleon was successfully measured over a momentum transfer range of 0.80 to 2.1 fm−1. Using a relativistic impulse approximation, the root-mean-square matter radius of 132Sn was extracted to be 4.758+0.023-0.024 fm, which was compared with the state-of-the-art ab initio calculations. Combined with the charge radius measured at ISOLDE, there are no theoretical calculations consistent with both matter and charge radii within the experimental errors.
