Asymmetric weak decay of polarized hypernuclei

S. Ajimura, H. Bhang, H. Ejiri, T. Hasegawa, O. Hashimoto, M. Ishikawa, K. Ikeda, Y. Kim, T. Kishimoto, K. Maeda, K. Manabe, T. Nagae, T. Nakano, H. Noumi, A. Okusu, H. Park, M. Sekimoto, T. Shibata, N. Shinkai, T. TakahashiY. Tanaka, M. Youn

Research output: Contribution to journalArticlepeer-review


We measured the asymmetric weak decay of the polarized 5ΛHe hypernuclei. The polarization was derived by the observed asymmetry of the mesonic decay pions for the first time. The asymmetry parameter of the nonmesonic decay has been evaluated using the obtained polarization and the asymmetry of the decay protons. The positive asymmetry parameter contradicts theoretical prediction based on meson exchange model. The present data indicates the limitation of the model in ΛN weak interaction, in particular short range phenomena such the nonmesonic decay of hypernuclei.

Original languageEnglish
Pages (from-to)285-288
Number of pages4
JournalNuclear Physics A
Issue number1-4
Publication statusPublished - 2000 May 8

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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