Lifetimes of Λ hypernuclei up to ΛFe

H. C. Bhang, S. Ajimura, K. Aoki, T. Hasegawa, O. Hashimoto, H. Hotchi, Y. D. Kim, T. Kishimoto, K. Maeda, H. Noumi, Y. Ohta, K. Omata, H. Outa, H. Park, Y. Sato, M. Sekimoto, T. Shibata, T. Takahashi, M. Youn

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13 Citations (Scopus)


We have observed that the global behavior of the lifetime of a Λ hyperon in nuclear matter is almost mass independent. Its lifetime decreases slightly from that of a free Λ and quickly saturates at ∼80% of τΛ in free space as the mass number increases. We have determined the lifetimes of three Λ hypernuclei as τ(12ΛCg.s.) = 231 ± 15 ps, τ(28ΛSig.s.) = 206 ± 12 ps and τ({56ΛFe}) = 215+14-13ps. The hypernuclei were produced by the (π+, K+) reaction and identified by the SKS spectrometer at the KEK 12 GeV PS. The lifetimes were obtained by a direct measurement of the production time of a hypernucleus and its decay time with two sets of timing/range counters. These are the first lifetime results of Λ hypernuclei over this broad mass range with the explicit identification of the produced hypernuclei.

Original languageEnglish
Pages (from-to)269c-278c
JournalNuclear Physics A
Issue number1-2
Publication statusPublished - 1998 Aug 24
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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