Abstract
We investigate the role of tensor correlation on the structures of 4He and its effect on the doublet splitting in 5He. We perform a configuration mixing calculation in the shell model type bases to represent the tensor correlation for 4He. It is found that our model describes the characteristics of the tensor correlation, which is represented by an admixture of the 0s1/2 configuration with a spatially modified 0p1/2 orbit. For 5He, we solve a coupled OCM equation for an extended 4He+n model, while taking into account the tensor correlation in the 4He cluster. It is shown that the tensor correlation produces the Pauli blocking, in particular, for the Jπ = 1/2− state, and its effect causes about half of the p-wave doublet splitting in 5He. This indicates that the strength of the effective spin-orbit interaction should be reduced by about half from the conventional one. We obtain a reliable 4He-n interaction, including the tensor correlation, which further improves the behavior of the d- and f-wave phase shifts in the 4He+n system.
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