Observation of a 6∧∧ He double hypernucleus

H. Takahashi, J. K. Ahn, H. Akikawa, S. Aoki, K. Arai, S. Y. Bahk, K. M. Baik, B. Bassalleck, J. H. Chung, M. S. Chung, D. H. Davis, T. Fukuda, K. Hoshino, A. Ichikawa, M. Ieiri, K. Imai, Y. H. Iwata, Y. S. Iwata, H. Kanda, M. KanekoT. Kawai, M. Kawasaki, C. O. Kim, J. Y. Kim, S. J. Kim, S. H. Kim, Y. Kondo, T. Kouketsu, Y. Lee, J. W.C. Mc Nabb, M. Mitsuhara, Y. Nagase, C. Nagoshi, K. Nakazawa, H. Noumi, S. Ogawa, H. Okabe, K. Oyama, H. M. Park, I. G. Park, J. Parker, Y. S. Ra, J. T. Rhee, A. Rusek, H. Shibuya, K. S. Sim, P. K. Saha, D. Seki, M. Sekimoto, J. S. Song, T. Takahashi, F. Takeutchi, H. Tanaka, K. Tanida, J. Tojo, H. Torii, S. Torikai, D. N. Tovee, N. Ushida, K. Yamamoto, N. Yasuda, J. T. Yang, C. J. Yoon, C. S. Yoon, M. Yosoi, T. Yoshida, L. Zhu

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A double-hyperfragment event has been found in a hybrid-emulsion experiment. It is identified uniquely as the sequential decay of 6∧ ∧ He emitted from a hyperon nuclear capture at rest. The mas of 6∧∧ He and the ∧ − ∧ interaction energy ΔB∧ ∧ have been measured for the first time devoid of the ambiguities due to the possibilities of excited states. The value of ΔB∧∧ is 1.01 ± 0.20+ 0.018-0.11MeV. This demonstrates that the ∧ − ∧ interaction is weakly attractive.

Original languageEnglish
Number of pages1
JournalPhysical Review Letters
Issue number21
Publication statusPublished - Jan 1 2001
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Takahashi, H., Ahn, J. K., Akikawa, H., Aoki, S., Arai, K., Bahk, S. Y., ... Zhu, L. (2001). Observation of a 6∧∧ He double hypernucleus. Physical Review Letters, 87(21). https://doi.org/10.1103/PhysRevLett.87.212502