Abstract
We investigate the roles of the tensor correlation on the structures of 4 He and 5 He . For 4 He , we take the high angular momentum states within the 2p2h excitations of the shell model type method to describe the tensor correlation explicitly. We found that the solutions show a good convergence and the obtained wave function has the large tensor correlation. We also found that three 2p2h configurations are largely coupled with (0s)4 one to describe the tensor correlation, which is understood from the selectivity of the tensor operator. This tensor correlation is also important to describe the scattering phenomena of the 4 He +n system including the higher partial waves consistently.
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