Nonmesonic decay of Λ and ΛΛ hypernuclei

Abstract

Nonmesonic weak decays of single- and double-Λ hypernuclei are studied on the basis of two-body baryon-baryon interactions, ΛN → NN and ΛΛ → YN transitions. The two-body weak transition is described by the combination of two processes, i.e., which are meson exchange and direct quark processes. The ΛΛ → YN transition in ΛΛ hypernucleus is complement to the ΛN → NN transition as it occurs only in the J = 0 channel, while the J = 1 transition is dominant in the ΛN → NN case.