Observation of Coulomb-Assisted Nuclear Bound State of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Ξ</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup><mml:mi>–</mml:mi><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">N</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>14</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:mrow></mml:math> System
S. Hayakawa, K. Agari, J. K. Ahn, T. Akaishi, Y. Akazawa, S. Ashikaga, B. Bassalleck, S. Bleser, H. Ekawa, Yuichi Endo, Y. Fujikawa, N. Fujioka, Masaya Fujita, R. Goto, Y. Han, Shoichi Hasegawa, T. Hashimoto, T. Hayakawa, E. Hayata, K. Hicks, E. Hirose, Masahiro Hirose, R. Honda, K. Hoshino, Satoshi Hoshino, K. Hosomi, S. H. Hwang, Y. Ichikawa, M. Ichikawa, K. Imai, K. Inaba, Yuji Ishikawa, H. Ito, K. Ito, W. S. Jung, S. Kanatsuki, H. Kanauchi, A. Kasagi, Takeshi Kawai, M. H. Kim, Se‐Hun Kim, Shinji Kinbara, R. Kiuchi, H. Kobayashi, Kazuya Kobayashi, T. Koike, Ami S. Koshikawa, J. Y. Lee, T. L., S. Y. Matsumoto, M. Minakawa, K. Miwa, A. T. Moe, T. J. Moon, Manabu Moritsu, Y. Nagase, Yasuki Nakada, Mayumi Nakagawa, D. Nakashima, Kimitaka Nakazawa, T. Nanamura, M. Naruki, A. N. L. Nyaw, Yu Ogura, M. Ohashi, K. Oue, Shin Ozawa, J. Pochodzalla, S. Y. Ryu, H. Sako, S. Sato, Y. Sato, Falk Schupp, K. Shirotori, M. M. Soe, Myint Kyaw Soe, J. Y. Sohn, Hitoshi Sugimura, K. N. Suzuki, H. Takahashi, T. Takahashi, T. Takeda, H. Tamura, K. Tanida, Aye Moh Moh Theint, K. T. Tint, Yuichi Toyama, M. Ukai, E. Umezaki, Toyoki Watabe, Ken Watanabe, T. O. Yamamoto, S. B. Yang, C.S. Yoon, Junya Yoshida, Masahiro Yoshimoto, D. H. Zhang, Z Zhang
Abstract
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.