Abstract
The four-body correlations in light nuclei are investigated from a viewpoint of many-body theoretical description. The four-body scattering modes are described in the quadratic form of two-body scattering modes. The two effects of the ground-state correlations and of the many-j configurations are taken into account by the random phase approximation, on the assumption of the spherical single-particle field. This mode-mode coupling model, which leads to a unified picture for even nuclei near closed-shell nuclei, is applied to the study of the low-lying positive-parity states of even nuclei in Ca region. Fundamental aspect of the level structures in 44Ti, 44Ca, 36Ar and 36S is reproduced. The structure of the four-body eigenmodes and electric-transition properties are investigated.
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