First observation of a nuclear s-state of a Ξ hypernucleus, 15ΞC

M. Yoshimoto, J. K. Ahn, B. Bassalleck, H. Ekawa, Y. Endo, M. Fujita, Y. Han, T. Hashimoto, S. H. Hayakawa, K. Hicks, K. Hoshino, S. Hoshino, S. H. Hwang, Y. Ichikawa, M. Ichikawa, K. Imai, Y. Ishikawa, H. Kanauchi, A. Kasagi, S. H. KimS. Kinbara, P. M. Lin, T. L. Ma, K. Miwa, A. T. Moe, Y. Nagase, K. Nakazawa, T. Nanamura, M. Naruki, A. N.L. Nyaw, J. Pochodzalla, H. Sako, S. Sato, M. M. Soe, M. K. Soe, J. Y. Sohn, H. Takahashi, T. Takahashi, H. Tamura, K. Tanida, A. M.M. Theint, K. T. Tint, M. Ukai, T. O. Yamamoto, S. B. Yang, C. S. Yoon, J. Yoshida, D. H. Zhang, Z. Zhang

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23 Citations (Scopus)


Bound systems of Ξ- -14N are studied via Ξ- capture at rest followed by emission of a twin single-Λ hypernucleus in the emulsion detectors. Two events forming extremely deep Ξ- bound states were obtained by analysis of a hybrid method in the E07 experiment at J-PARC and reanalysis of the E373 experiment at KEK-PS. The decay mode of one event was assigned as Ξ- +14N → 5λHe +5λHe +4He + n. Since there are no excited states for daughter particles, the binding energy of the Ξ- hyperon, BΞ-, in the 14N nucleus was uniquely determined to be 6.27 ± 0.27MeV. Another Ξ- -14N system via the decay 9 λBe +5λHe + n brings a BΞ- value, 8.00 ± 0.77MeV or 4.96 ± 0.77MeV, where the two possible values of BΞ- correspond to the ground and the excited states of the daughter 9λ Be nucleus, respectively. Because the BΞ- values are larger than those of the previously reported events (KISO and IBUKI), which are both interpreted as the nuclear 1p state of the Ξ-14Nsystem, these newevents give the first indication of the nuclear 1s state of the Ξ hypernucleus, 15ΞC.

Original languageEnglish
Article number073D02
JournalProgress of Theoretical and Experimental Physics
Issue number7
Publication statusPublished - 2021 Jul 1


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