A SYSTEMATIC STUDY OF THE TENSOR CORRELATION IN He AND Li ISOTOPES

We investigate the tensor correlations in He and Li isotopes systematically. We propose the tensor-optimized shell model (TOSM) to describe the strong tensor correlation arising from the bare nuclear force in nuclei. Using TOSM for Li isotopes, we investigate the anomalous structures of ^9,10,11Li based on the ⁹Li+n+n model where the ⁹Li cluster is described by TOSM. As a result, the couplings between the tensor correlation in ⁹Li and the extra two neutrons emerge Pauli-blocking, which naturally increases the s² component to develop the halo structure in ¹¹Li. We further describe the short-range correlation arising from the repulsive core in the bare nuclear force by the unitary correlation operator method (UCOM). We propose the new framework of TOSM+UCOM for the nuclear structure study starting from the bare nuclear force.