# 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

79 被引用数 (Scopus)

## 抄録

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.

本文言語 English 033D02 Progress of Theoretical and Experimental Physics 2015 3 https://doi.org/10.1093/ptep/ptv008 Published - 2014 11 7 はい

## ASJC Scopus subject areas

• 物理学および天文学（全般）

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