Double-Λ hypernuclei observed in a hybrid emulsion experiment

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, K. Itonaga, Y. H. Iwata, Y. S. Iwata, H. Kanda, M. KanekoT. Kawai, M. Kawasaki, C. O. Kim, J. Y. Kim, S. H. Kim, S. J. Kim, Y. Kondo, T. Kouketsu, H. N. Kyaw, Y. L. Lee, J. W.C. McNabb, A. A. Min, M. Mitsuhara, K. Miwa, K. Nakazawa, Y. Nagase, C. Nagoshi, Y. Nakanishi, H. Noumi, S. Ogawa, H. Okabe, K. Oyama, B. D. Park, H. M. Park, I. G. Park, J. Parker, Y. S. Ra, J. T. Rhee, A. Rusek, A. Sawa, H. Shibuya, K. S. Sim, P. K. Saha, D. Seki, M. Sekimoto, J. S. Song, H. Takahashi, T. Takahashi, F. Takeutchi, H. Tanaka, K. Tanida, K. T. Tint, J. Tojo, H. Torii, S. Torikai, D. N. Tovee, T. Tsunemi, M. Ukai, N. Ushida, T. Wint, K. Yamamoto, N. Yasuda, J. T. Yang, C. J. Yoon, C. S. Yoon, M. Yosoi, T. Yoshida, L. Zhu

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Abstract

A hybrid experiment with nuclear emulsion and scintillating-fiber detectors (KEK-E373) has been performed to search for double-strangeness systems. Among about 103 events of Ξ- hyperons captured at rest by emulsion nuclei, we have observed four events which clearly show the topology of cascade weak decays of double-Λ hypernuclei including the "Nagara" event. Regarding the Nagara event, values of the two-Λ binding energy (BΛΛ) and the Λ-Λ interaction energy (ΔBΛΛ) of ΛΛ6He have been revised to 6.91 ± 0.16 and 0.67 ± 0.17 MeV, respectively, due to the recent change of the Ξ- mass value (Particle Data Group). For another three events, we have determined possible species of double-Λ hypernuclei together with their binding energies.

Original languageEnglish
Article number014003
JournalPhysical Review C - Nuclear Physics
Volume88
Issue number1
DOIs
Publication statusPublished - 2013 Jul 17

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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