Nucleon-nucleon coincidence measurement in the non-mesonic weak decay of 5ΛHe and 12ΛC hypernuclei

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

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


We have measured both yields of neutron-proton and neutron-neutron pairs emitted from the non-mesonic weak decay process of Λ 5He and Λ12C hypernuclei produced via the (π+, K+) reaction for the first time. We observed clean back-to-back correlation of the np- and nn-pairs in the coincidence spectra for both hypernuclei. The ratio of those back-to-back pair yields, Nnn/Nnp, must be close to the ratio of neutron- and proton-induced decay widths of the decay, Γn (Λn → nn)/Γp(Λp → np). The obtained ratios for each hypernuclei support recent calculations based on short-range interactions.

Original languageEnglish
Pages (from-to)196-199
Number of pages4
JournalNuclear Physics A
Issue number1-4 SPEC. ISS.
Publication statusPublished - 2005 Apr 18

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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