2026-05-02T15:31:01Z https://meral.edu.mm/oai

oai:meral.edu.mm:recid/954 2021-12-13T01:44:51Z 1582963739756:1582967025340 user-um

The first evidence of a deeply bound state of Xi−–14N system Nakazawa, K. Endo, Y. Fukunaga, S. Hoshino, K. Hwang, S. H. Imai, K. Ito, H. Itonaga, K. Kanda, T. Kawasaki, M. Kim, J. H. Kinbara, S. Kobayashi, H. Mishina, A. Ogawa, S. Shibuya, H. Sugimura, T. Myint Kyaw Soe Takahashi, H. Takahashi, T. Khin Than Tint Umehara, K. Yoon, C. S. Yoshida, J. We have observed a deeply bound state of the Ξ−–14N system that decayed into twin single-hypernuclei in nuclear emulsion exposed in the E373 experiment at KEK-PS. The process is uniquely identified as Ξ−+14N→10ΛBe+5ΛHe⁠. We have measured the binding energy of the Ξ−–14N system, BΞ−⁠, to be 4.38±0.25MeV, which is significantly larger than that of the Ξ−–14N 3D atomic state (0.17 MeV), if both single-hypernuclei are emitted in the ground state from at-rest capture of a Ξ− hyperon. If the 10ΛBe nucleus is produced in an excited state, the BΞ− value mentioned above decreases by the excitation energy. Model calculations based on known values for 9Be excited states have predicted two excited states in the bound region. Even in the case of 10ΛBe production in the highest excited state, the BΞ− value is far from the 3D atomic level of the Ξ−–14N system by more than 3.7 standard deviations. The event provides the first clear evidence of a deeply bound state of the Ξ−–14N system by an attractive ΞN interaction. 2015 http://hdl.handle.net/20.500.12678/0000000954 https://meral.edu.mm/records/954