Probable alpha and 14C cluster emission from hyper Ac nuclei

A systematic study on the probability for the emission of 4He and 14C cluster from hyper Λ207-234Ac and non-strange normal 207-234Ac nuclei are performed for the first time using our fission model, the Coulomb and proximity potential model (CPPM). The predicted half lives show that hyper Λ207-234Ac nuclei are unstable against 4He emission and 14C emission from hyper Λ217-228Ac are favorable for measurement. Our study also show that hyper Λ207-234Ac are stable against hyper Λ4He and Λ14C emission. The role of neutron shell closure (N = 126) in hyper Λ214Fr daughter and role of proton/neutron shell closure (Z ∼ 82, N = 126) in hyper Λ210Bi daughter are also revealed. As hyper-nuclei decays to normal nuclei by mesonic/non-mesonic decay and since most of the predicted half lives for 4He and 14C emission from normal Ac nuclei are favourable for measurement, we presume that alpha and 14C cluster emission from hyper Ac nuclei can be detected in laboratory in a cascade (two-step) process. (orig.)