The weak decay widths of Λ hypernuclei

H. Bhang, S. Ajimura, K. Aoki, A. Banu, T. Fukuda, O. Hashimoto, J. I. Hwang, S. Kameoka, B. H. Kang, E. Kim, J. H. Kim, T. Maruta, Y. Miura, Y. Miyake, T. Nagae, M. Nakamura, S. N. Nakamura, H. Noumi, S. Okada, Y. OkayasuH. Outa, H. Park, P. K. Saha, Y. Sato, M. Sekimoto, T. Takahashi, H. Tamura, K. Tanida, A. Toyoda, K. Tshoo, Kyo Tsukada, T. Watanabe, H. J. Yim

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


We have measured both the mesonic and nonmesonic weak decay widths of Λ12C. For the mesonic decay, we have improved the accuracy of Γπ0 so that it reduced the error of Γnm from ≥10% to ≤5%. For the nonmesonic decay, we have solved the long standing Γnp puzzle by measuring the ratio 0.51 ± 0.14 in the exclusive measurement. At the same time we have measured the width of the 3-body nonmesonic decay Γ 2N = 0.27 ± 0.13 for the first time. Combining the accurate Γnp ratio and the first measured value Γ2N, we have finally obtained the Γn and Γp themselves taking account of the 3-body process. We have measured all the weak decay widths of Λ12C so that it provides the first complete set of widths for the investigation of ΔS = 1 baryon-baryon weak interaction.

Original languageEnglish
Pages (from-to)1461-1466
Number of pages6
JournalJournal of the Korean Physical Society
Issue number23
Publication statusPublished - 2011 Aug


  • Decay width
  • ENDF
  • Hypernucleus
  • ND2010
  • Nonmesonic weak decay (NMWD)
  • Nuclear data
  • Three-body decay

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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