Lifetime Measurement of 12ΛC, 28ΛSi, and ΛFe Hypernuclei

H. 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. Takahashi, T. Takahashi, M. Youn

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78 Citations (Scopus)


We have measured lifetimes of Λ hypernuclei over a broad mass range explicitly identifying Λ hypernuclear production in the \(π+, K+\) reaction. The obtained results are τ\(12ΛC\) = 231+/-15 ps, τ\(28ΛSi\) = 206+/-12 ps, and τ\(ΛFe\) = 215+/-14 ps. The lifetimes of Λ hypernuclei over the mass region from carbon to iron are found almost constant at about 80% of that of free Λ within the statistical uncertainties. The short-range nature of the nonmesonic weak decay process, which is dominant in heavy Λ hypernuclei, is possibly responsible for the observed weak hypernuclear mass dependence.

Original languageEnglish
Pages (from-to)4321-4324
Number of pages4
JournalPhysical review letters
Issue number20
Publication statusPublished - 1998 Nov 16
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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