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arXiv · 2010.14317

Observation of Coulomb-assisted nuclear bound state of $\Xi^-$-$^{14}$N system

S. H. Hayakawa·K. Agari·J. K. Ahn·T. Akaishi·Y. Akazawa·S. Ashikaga·B. Bassalleck·S. Bleser·H. Ekawa·Y. Endo·Y. Fujikawa·N. Fujioka·M. Fujita·R. Goto·Y. Han·S. Hasegawa·T. Hashimoto·T. Hayakawa·E. Hayata·K. Hicks·E. Hirose·M. Hirose·R. Honda·K. Hoshino·S. Hoshino·K. Hosomi·S. H. Hwang·Y. Ichikawa·M. Ichikawa·K. Imai·K. Inaba·Y. Ishikawa·H. Ito·K. Ito·W. S. Jung·S. Kanatsuki·H. Kanauchi·A. Kasagi·T. Kawai·M. H. Kim·S. H. Kim·S. Kinbara·R. Kiuchi·H. Kobayashi·K. Kobayashi·T. Koike·A. Koshikawa·J. Y. Lee·T. L. Ma·S. Y. Matsumoto·M. Minakawa·K. Miwa·A. T. Moe·T. J. Moon·M. Moritsu·Y. Nagase·Y. Nakada·M. Nakagawa·D. Nakashima·K. Nakazawa·T. Nanamura·M. Naruki·A. N. L. Nyaw·Y. Ogura·M. Ohashi·K. Oue·S. Ozawa·J. Pochodzalla·S. Y. Ryu·H. Sako·S. Sato·Y. Sato·F. Schupp·K. Shirotori·M. M. Soe·M. K. Soe·J. Y. Sohn·H. Sugimura·K. N. Suzuki·H. Takahashi·T. Takahashi·T. Takeda·H. Tamura·K. Tanida·A. M. M. Theint·K. T. Tint·Y. Toyama·M. Ukai·E. Umezaki·T. Watabe·K. Watanabe·T. O. Yamamoto·S. B. Yang·C. S. Yoon·J. Yoshida·M. Yoshimoto·D. H. Zhang·Z. Zhang
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Abstract

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

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S. H. Hayakawa, K. Agari, J. K. Ahn, T. Akaishi, Y. Akazawa, S. Ashikaga, B. Bassalleck, S. Bleser, H. Ekawa, Y. Endo, Y. Fujikawa, N. Fujioka, M. Fujita, R. Goto, Y. Han, S. Hasegawa, T. Hashimoto, T. Hayakawa, E. Hayata, K. Hicks, E. Hirose, M. Hirose, R. Honda, K. Hoshino, S. Hoshino, K. Hosomi, S. H. Hwang, Y. Ichikawa, M. Ichikawa, K. Imai, K. Inaba, Y. Ishikawa, H. Ito, K. Ito, W. S. Jung, S. Kanatsuki, H. Kanauchi, A. Kasagi, T. Kawai, M. H. Kim, S. H. Kim, S. Kinbara, R. Kiuchi, H. Kobayashi, K. Kobayashi, T. Koike, A. Koshikawa, J. Y. Lee, T. L. Ma, S. Y. Matsumoto, M. Minakawa, K. Miwa, A. T. Moe, T. J. Moon, M. Moritsu, Y. Nagase, Y. Nakada, M. Nakagawa, D. Nakashima, K. Nakazawa, T. Nanamura, M. Naruki, A. N. L. Nyaw, Y. Ogura, M. Ohashi, K. Oue, S. Ozawa, J. Pochodzalla, S. Y. Ryu, H. Sako, S. Sato, Y. Sato, F. Schupp, K. Shirotori, M. M. Soe, M. K. Soe, J. Y. Sohn, H. Sugimura, K. N. Suzuki, H. Takahashi, T. Takahashi, T. Takeda, H. Tamura, K. Tanida, A. M. M. Theint, K. T. Tint, Y. Toyama, M. Ukai, E. Umezaki, T. Watabe, K. Watanabe, T. O. Yamamoto, S. B. Yang, C. S. Yoon, J. Yoshida, M. Yoshimoto, D. H. Zhang, Z. Zhang. 2020-10-27. Observation of Coulomb-assisted nuclear bound state of $\Xi^-$-$^{14}$N system. https://doi.org/10.1103/physrevlett.126.062501

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