Nuclear capture at rest of Ξ- hyperons

S. Aoki, S. Y. Bahk, S. H. Chung, H. Funahashi, C. H. Hahn, M. Hanabata, T. Hara, S. Hirata, K. Hoshino, M. Ieiri, T. Iijima, K. Imai, Y. Itow, T. Jin-ya, M. Kazuno, C. O. Kim, J. Y. Kim, S. H. Kim, K. Kodama, T. KuzeY. Maeda, A. Masaike, A. Masuoka, Y. Matsuda, A. Matsui, Y. Nagase, C. Nagoshi, M. Nakamura, S. Nakanishi, T. Nakano, K. Nakazawa, K. Niwa, H. Oda, H. Okabe, S. Ono, R. Ozaki, B. D. Park, I. G. Park, K. Sakai, T. Sasaki, Y. Sato, H. Shibuya, H. M. Shimizu, J. S. Song, M. Sugimoto, H. Tajima, H. Takahashi, R. Takashima, F. Takeutchi, K. H. Tanaka, M. Teranaka, I. Tezuka, H. Togawa, T. Tsunemi, M. Ukai, N. Ushida, T. Watanabe, N. Yasuda, J. Yokota, C. S. Yoon

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

An emulsion-counter hybrid experiment (KEK E176) was carried out to search for double strangeness systems such as double-Λ hypernuclei and H-dibaryons. More than 10% of Ξ- hyperons produced in the (K-, K+) reaction were brought to rest in the nuclear emulsion. We have obtained 98 candidate events of nuclear capture at rest of Ξ- hyperons which are described in this report. Among those, four events were identified as sequential weak decay of double-Λ hypernuclei. The binding energies of Ξ--(12C, 14N and 16O) states have been estimated for two events which emit twin single-Λ hypernuclei back to back from the capture point. The Σ- p decay vertex of an H-dibaryon was searched for near the capture point and no evidence was observed. Upper limits for the branching ratio of H emission are 5-10% for a lifetime less than 0.1 ns at the 90% confidence level. The trapping probabilities of single and double strangeness to a nuclear fragment following Ξ- capture at rest have been studied.

Original languageEnglish
Pages (from-to)191-232
Number of pages42
JournalNuclear Physics A
Volume828
Issue number3-4
DOIs
Publication statusPublished - 2009 Sep 15
Externally publishedYes

Keywords

  • C
  • Hybrid emulsion experiment
  • N
  • Nuclear reactions
  • O(Ξ, X)
  • binding energies
  • deduced
  • double-Λ and twin-Λ hypernuclei production
  • measured
  • particle tracks following hypernucleus production
  • subsequent decay
  • Ξ capture at rest

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Aoki, S., Bahk, S. Y., Chung, S. H., Funahashi, H., Hahn, C. H., Hanabata, M., Hara, T., Hirata, S., Hoshino, K., Ieiri, M., Iijima, T., Imai, K., Itow, Y., Jin-ya, T., Kazuno, M., Kim, C. O., Kim, J. Y., Kim, S. H., Kodama, K., ... Yoon, C. S. (2009). Nuclear capture at rest of Ξ- hyperons. Nuclear Physics A, 828(3-4), 191-232. https://doi.org/10.1016/j.nuclphysa.2009.07.005