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ヤマガタ ジュンコ
YAMAGATA JUNKO
山縣 淳子 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 | 2020/12 |
| 形態種別 | 研究論文 |
| 標題 | An event excess observed in the deeply bound region of the C-12(K-,p) missing-mass spectrum |
| 執筆形態 | その他 |
| 掲載誌名 | PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS |
| 出版社・発行元 | OXFORD UNIV PRESS INC |
| 巻・号・頁 | 2020(12) |
| 著者・共著者 | Yudai Ichikawa,Junko Yamagata-Sekihara,Jung Keun Ahn,Yuya Akazawa,Kanae Aoki,Elena Botta,Hiroyuki Ekawa,Petr Evtoukhovitch,Alessandro Feliciello,Manami Fujita,Toshiyuki Gogami,Shoichi Hasegawa,Tomoyuki Hasegawa,Shuhei Hayakawa,Tomonori Hayakawa,Satoru Hirenzaki,Ryotaro Honda,Kenji Hosomi,Ken'ichi Imai,Wooseung Jung,Shunsuke Kanatsuki,Shin Hyung Kim,Shinji Kinbara,Kazuya Kobayashi,Jaeyong Lee,Simonetta Marcello,Koji Miwa,Taejin Moon,Tomofumi Nagae,Yoshiyuki Nakada,Manami Nakagawa,Takuya Nanamura,Megumi Naruki,Atsushi Sakaguchi,Hiroyuki Sako,Susumu Sato,Yuki Sasaki,Kotaro Shirotori,Hitoshi Sugimura,Toshiyuki Takahashi,Hirokazu Tamura,Kiyoshi Tanida,Zviadi Tsamalaidze,Mifuyu Ukai,Takeshi O. Yamamoto |
| 概要 | We have measured, for the first time, the inclusive missing-mass spectrum of the C-12(K-,p) reaction at an incident kaon momentum of 1.8 GeV/c at the J-PARC K1.8 beamline. We observed a prominent quasi-elastic peak (K- p -> K- p) in this spectrum. In the quasi-elastic peak region, the effect of secondary interaction is apparently observed as a peak shift, and the peak exhibits a tail in the bound region. We compared the spectrum with a theoretical calculation based on the Green's function method by assuming different values of the parameters for the (K) over bar -nucleus optical potential. We found that the spectrum shape in the binding-energy region -300 MeV < B-K < 40 MeV is best reproduced with the potential depths V-0 = -80 MeV (real part) and W-0 = -40 MeV (imaginary part). On the other hand, we observed a significant event excess in the deeply bound region around B-K similar to 100 MeV, where the major decay channel of K- NN -> pi Sigma N is energetically closed, and the non-mesonic decay modes (K- NN -> Lambda N and Sigma N) should mainly contribute. The enhancement is fitted well by a Breit-Wigner function with a kaon-binding energy of 90 MeV and width 100 MeV. A possible interpretation is a deeply bound state of a Y*-nucleus system. |
| DOI | 10.1093/ptep/ptaa139 |
| ISSN | 2050-3911 |