Abstract
Recent experimental results obtained for neutron-rich nuclei of mass A~60-70 at LNL are presented together with the shell model interpretation. The development of a new region of deformation approaching the neutron number N = 40 in Cr, Fe and Co isotopes is discussed. A new effective interaction (LNPS) that considers the full fp shell model space for protons and the p3/2, p1/2, f5/2, g9/2, d5/2 orbitals for the neutrons allows to reproduce, for the first time, the different structure properties of these nuclei. The configurations of the calculated states suggest the development of a new island of inversion at N ~ 40.
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