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Large Scale Shell Model calculations (SM-CI) predict that the region ofdeformation which comprises the heaviest Chromium and Iron isotopes at andbeyond N=40 will merge with a new one at N=50 in an astonishing parallel to theN=20 and N=28 case in the Neon and Magnesium isotopes. We propose a valencespace including the full pf-shell for the protons and the full sdg shell forthe neutrons; which represents a comeback of the the harmonic oscillator shellsin the very neutron rich regime. The onset of deformation is understood in theframework of the algebraic SU3-like structures linked to quadrupole dominance.Our calculations preserve the doubly magic nature of the ground state of 78 Ni,which, however, exhibits a well deformed prolate band at low excitation energy,providing a striking example of shape coexistence far from stability.

Shape Coexistence in 78 Ni and the new Island of Inversion