X iv : n uc l - th / 0 41 10 86 v 1 2 1 N ov 2 00 4 1 Tensor correlation in 4 He and its effect on the doublet splitting in 5

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