The first evidence of a deeply bound state of Xi ' ' - 14 N system

K. Nakazawa, Y. Endo, S. Fukunaga, K. Hoshino, S. H. Hwang, K. Imai, H. Ito, K. Itonaga, T. Kanda, M. Kawasaki, J. H. Kim, S. Kinbara, H. Kobayashi, A. Mishina, S. Ogawa, H. Shibuya, T. Sugimura, M. K. Soe, H. Takahashi, T. TakahashiK. T. Tint, K. Umehara, C. S. Yoon, J. Yoshida

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89 Citations (Scopus)


We have observed a deeply bound state of the $\Xi {-}$-${} {14}{\rm N}$ system that decayed into twin single-hypernuclei in nuclear emulsion exposed in the E373 experiment at KEK-PS. The process is uniquely identified as $\Xi {-} + {}{14}{\rm N} \rightarrow {{}{10}-{\Lambda }{\rm Be}} + {{}{5}-{\Lambda }{\rm He}}$. We have measured the binding energy of the $\Xi {-}$-${}{14}{\rm N}$ system, $B-{\Xi {-}}$, to be $4.38 \pm 0.25$MeV, which is significantly larger than that of the $\Xi {-}$-${}{14}{\rm N}$ 3$D$ atomic state (0.17' €‰MeV), if both single-hypernuclei are emitted in the ground state from at-rest capture of a $\Xi {-}$ hyperon. If the ${{}{10}-{\Lambda }{\rm Be}}$ nucleus is produced in an excited state, the $B-{\Xi {-}}$ value mentioned above decreases by the excitation energy. Model calculations based on known values for ${{}{9}{\rm Be}}$ excited states have predicted two excited states in the bound region. Even in the case of ${{}{10}-{\Lambda }{\rm Be}}$ production in the highest excited state, the $B-{\Xi {-}}$ value is far from the 3$D$ atomic level of the $\Xi {-}$-${}{14}{\rm N}$ system by more than 3.7 standard deviations. The event provides the first clear evidence of a deeply bound state of the $\Xi {-}$-${}{14}{\rm N}$ system by an attractive $\Xi$N interaction.

Original languageEnglish
Article number033D02
JournalProgress of Theoretical and Experimental Physics
Issue number3
Publication statusPublished - 2014 Nov 7
Externally publishedYes


  • D01

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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