Shell-model description of neutron-rich pf-shell nuclei with a new effective interaction GXPF 1

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Abstract.

The shell-model effective interaction GXPF1 is tested for the description of unstable pf-shell nuclei. The GXPF1 successfully describes the N = 32 shell gap in Ca, Ti and Cr isotopes, while the deviation of predicted E x(2+ 1) in 56Ti from the recent experimental data requires the modification of the Hamiltonian especially in the T = 1 matrix elements related to the p 1/2 and f 5/2 orbits. The modified interaction gives improved description simultaneously for all these isotope chains.