Observation of Coulomb-Assisted Nuclear Bound State of Ξ^{-}-^{14}N System

• Published in: Physical review letters 2021-02, Vol.126 (6), p.062501-062501
• Main Authors: Hayakawa, S H, Agari, K, Ahn, J K, Akaishi, T, Akazawa, Y, Ashikaga, S, Bassalleck, B, Bleser, S, Ekawa, H, Endo, Y, Fujikawa, Y, Fujioka, N, Fujita, M, Goto, R, Han, Y, Hasegawa, S, Hashimoto, T, Hayakawa, T, Hayata, E, Hicks, K, Hirose, E, Hirose, M, Honda, R, Hoshino, K, Hoshino, S, Hosomi, K, Hwang, S H, Ichikawa, Y, Ichikawa, M, Imai, K, Inaba, K, Ishikawa, Y, Ito, H, Ito, K, Jung, W S, Kanatsuki, S, Kanauchi, H, Kasagi, A, Kawai, T, Kim, M H, Kim, S H, Kinbara, S, Kiuchi, R, Kobayashi, H, Kobayashi, K, Koike, T, Koshikawa, A, Lee, J Y, Ma, T L, Matsumoto, S Y, Minakawa, M, Miwa, K, Moe, A T, Moon, T J, Moritsu, M, Nagase, Y, Nakada, Y, Nakagawa, M, Nakashima, D, Nakazawa, K, Nanamura, T, Naruki, M, Nyaw, A N L, Ogura, Y, Ohashi, M, Oue, K, Ozawa, S, Pochodzalla, J, Ryu, S Y, Sako, H, Sato, S, Sato, Y, Schupp, F, Shirotori, K, Soe, M M, Soe, M K, Sohn, J Y, Sugimura, H, Suzuki, K N, Takahashi, H, Takahashi, T, Takeda, T, Tamura, H, Tanida, K, Theint, A M M, Tint, K T, Toyama, Y, Ukai, M, Umezaki, E, Watabe, T, Watanabe, K, Yamamoto, T O, Yang, S B, Yoon, C S, Yoshida, J, Yoshimoto, M, Zhang, D H, Zhang, Z
• Format: Article
• Language: English
• ISSN: 1079-7114
• DOI: 10.1103/PhysRevLett.126.062501

In an emulsion-counter hybrid experiment performed at J-PARC, a Ξ^{-} absorption event was observed which decayed into twin single-Λ hypernuclei. Kinematic calculations enabled a unique identification of the reaction process as Ξ^{-}+^{14}N→_{Λ}^{10}Be+_{Λ}^{5}He. For the binding energy of the Ξ^{-} hyperon in the Ξ^{-}-^{14}N system a value of 1.27±0.21  MeV was deduced. The energy level of Ξ^{-} is likely a nuclear 1p state which indicates a weak ΞN-ΛΛ coupling.