Modern shell-model diagonalizations with realistic NN forces
Abstract
The spectral and statistical properties of nuclei 46V and 48Cr are studied in the framework of nuclear shell model. A microscopical effective Hamiltonian derived from the CD-Bonn NN potential is employed. The calculations are preliminary results of a newly developed parallel shell-model code. Calculations with the realistic NN interaction reproduce well the ground-state rotational band and backbending phenomenon in 48Cr. A sudden alignment of all particles is seen above the backbend. The nearest-neighbour spacing distribution in 46V is presented and compared with the predictions of random-matrix theory. Significant deviation from the single Gaussian-orthogonal-ensemble distribution is obtained, indicating that the isospin-symmetry breaking is not so strong in the nucleus.
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