Mesonic and non-mesonic decay widths of 4ΛH and 4ΛHe

H. Outa, M. Aoki, R. S. Hayano, T. Ishikawa, M. Iwasaki, A. Sakaguchi, E. Takada, H. Tamura, T. Yamazaki

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Abstract

Results are reported on precise measurements of the weak-decay processes of 4ΛH and 4ΛHe hypernuclei formed via the 4He(K-stopped, π-) reaction. The lifetimes of 4ΛH (194+24-26 ps) and 4ΛHe (256 ± 27 ps) were obtained. The π0 and π- decay branching ratios of 4ΛHe (0.515 ± 0.035 and 0.322 ± 0.034, respectively) were precisely determined and they are compared with recent theoretical estimates and related experimental values. Our results favor a Λnucleus interaction with an inner repulsive core. The non-mesonic weak decay widths of 4ΛH and 4ΛHe are reexamined on the basis of our measurements and updated knowledge of the mesonic decay processes. It is found that the non-mesonic decay of 4ΛHe predominantly takes place via the Λ + p → n + p process.

Original languageEnglish
Pages (from-to)251c-260c
JournalNuclear Physics A
Volume639
Issue number1-2
Publication statusPublished - 1998 Aug 24

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Outa, H., Aoki, M., Hayano, R. S., Ishikawa, T., Iwasaki, M., Sakaguchi, A., Takada, E., Tamura, H., & Yamazaki, T. (1998). Mesonic and non-mesonic decay widths of 4ΛH and 4ΛHe. Nuclear Physics A, 639(1-2), 251c-260c.