Elsevier

Nuclear Physics A

Volume 639, Issues 1–2, 24 August 1998, Pages 269c-278c
Nuclear Physics A

Lifetimes of Λ hypernuclei up toΛFe

https://doi.org/10.1016/S0375-9474(98)00283-8Get rights and content

Abstract

We have observed that the global behavior of the lifetime of a A 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(Λ12 Cg.s.) = 231 ± 15 ps, τ(Λ28 Sig.s.) = 206 ± 12 ps and τ(Λ56 Fe) = 215−13+14 ps. 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 A hypernuclei over this broad mass range with the explicit identification of the produced hypernuclei.

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