Neutron energy spectra from the nonmesonic weak decay of Λ 12C and Λ89Y hypernuclei

J. H. Kim, H. Bhang, M. J. Kim, Y. D. Kim, H. Park, S. Ajimura, T. Kishimoto, S. Minami, T. Mori, A. Sakaguchi, Y. Shimizu, M. Sumihama, T. Endo, O. Hashimoto, T. Miyoshi, J. Nishida, T. Saito, Y. Sato, S. Satoh, T. TakahashiH. Tamura, T. Fukuda, T. Nagae, H. Noumi, H. Outa, M. Sekimoto, H. Hotchi, K. Tanida, R. Sawafta, L. I. Tang

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


We have measured the neutron spectra emitted in the weak decay of Λ12C and Λ89Y over the energy region above 10 MeV in the (π+, K+) reaction with better statistics and an improved signal-to-background ratio. The neutron yields in the nonmesonic weak decays were obtained from the spectra. By using the proton yield of Λ12C, the Γnp ratio was estimated to be 0.51±0.15 (stat) from the neutron-to-proton yield ratio for the first time, which suggests the Γ np ratio is significantly less than unity.

Original languageEnglish
Article number065201
Pages (from-to)652011-652015
Number of pages5
JournalPhysical Review C - Nuclear Physics
Issue number6
Publication statusPublished - 2003 Dec


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