K̄ and nucleus system studied by 12C(K -, p) spectrum

Yudai Ichikawa, Junko Yamagata-Sekihara, Jung Keun Ahn, Yuya Akazawa, Kanae Aoki, Elena Bottta, 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 JungShunsuke Kanatsuki, Shinhyung Kim, Sinji 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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We have measured an inclusive missing-mass spectrum of the 12 C(K-, p) reaction over wide energy region at the kaon incident momentum of 1.8 GeV/c at J-PARC K1.8 beam line. This measurement was carried out as a by-product of a pilot run of J-PARC E05 experiment, which searched for the Ξ-hypernuclei via 12C(K-, K+) reaction. We have compared the observed missing-mass spectrum with a DWIA calculation to study the K̄-nucleus interaction. In this comparison, we have changed the depth of both real and imaginary parts of the optical potential between the K̄ and nucleus. It is found that the observed spectrum is best reproduced by the calculation of the potential depth of V0 ∼-80 MeV (real part) and W0 ∼-40 MeV (imaginary part). On the other hand, we have observed a definitive excess around the deeply bound region BK ≳ 100 MeV. The excess cannot be explained by the any optical potential and quasi-free background reaction. It is well fitted with a Breit-Wigner function with a binding energy of 90 MeV and a width of 100 MeV, which can be interpreted as a deeply bound Λ(1405) nucleus.

Original languageEnglish
Title of host publication13th International Conference on Hypernuclear and Strange Particle Physics, HYP 2018
EditorsReinhard Schumacher, Liguang Tang
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735418721
DOIs
Publication statusPublished - 2019 Jul 25
Event13th International Conference on Hypernuclear and Strange Particle Physics, HYP 2018 - Portsmouth, United States
Duration: 2018 Jun 242018 Jun 29

Publication series

NameAIP Conference Proceedings
Volume2130
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference13th International Conference on Hypernuclear and Strange Particle Physics, HYP 2018
CountryUnited States
CityPortsmouth
Period18/6/2418/6/29

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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