Nonmesonic Decays of 4 H, 4 He and 5 He Hypernuclei by the and Exchange Model

The nonmesonic decay rates of 4ΛH, 4ΛHe and 5ΛHe are evaluated by employing the π and ρ exchange model with realistic ΛN and NN correlation functions. The tensor dominating nature characterizes the decay interaction in this model and gives very different decay rates for 4ΛH and 4ΛHe.