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新山 雅之 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2020/05 |
| 形態種別 | その他 |
| 査読 | 査読あり |
| 標題 | Search for η′ Bound Nuclei in the C12(γ,p) Reaction with Simultaneous Detection of Decay Products |
| 執筆形態 | その他 |
| 掲載誌名 | Physical Review Letters |
| 出版社・発行元 | American Physical Society (APS) |
| 巻・号・頁 | 124(20) |
| 担当区分 | 筆頭著者 |
| 著者・共著者 | N. Tomida,N. Muramatsu,M. Niiyama,J. K. Ahn,W. C. Chang,J. Y. Chen,M. L. Chu,S. Daté,T. Gogami,H. Goto,H. Hamano,T. Hashimoto,Q. H. He,K. Hicks,T. Hiraiwa,Y. Honda,T. Hotta,H. Ikuno,Y. Inoue,T. Ishikawa,I. Jaegle,J. M. Jo,Y. Kasamatsu,H. Katsuragawa,S. Kido,Y. Kon,T. Maruyama,S. Masumoto,Y. Matsumura,M. Miyabe,K. Mizutani,H. Nagahiro,T. Nakamura,T. Nakano,T. Nam,T. N. T. Ngan,Y. Nozawa,Y. Ohashi,H. Ohnishi,T. Ohta,K. Ozawa,C. Rangacharyulu,S. Y. Ryu,Y. Sada,M. Sasagawa,T. Shibukawa,H. Shimizu,R. |
| 概要 | We measured missing mass spectrum of the C-12(gamma, p) reaction for the first time in coincidence with potential decay products from q' bound nuclei. We tagged an (eta + p) pair associated with the eta'N -> eta N process in a nucleus. After applying kinematical selections to reduce backgrounds, no signal events were observed in the bound-state region. An upper limit of the signal cross section in the opening angle theta(eta 9)(lab) < -0.9 was obtained to be 2.2 nb/sr at the 90% confidence level. It is compared with theoretical cross sections, whose normalization ambiguity is suppressed by measuring a quasifree eta' production rate. Our results indicate a small branching fraction of the eta'N -> eta N process and/or a shallow eta'-nucleus potential. |
| DOI | 10.1103/physrevlett.124.202501 |
| ISSN | 0031-9007/1079-7114 |
| PermalinkURL | https://link.aps.org/article/10.1103/PhysRevLett.124.202501 |
| researchmap用URL | http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.124.202501/fulltext |