Abstract
The A ≃ 60-70 mass region of neutron-rich nuclei with Z ≤ 28 presents several interesting properties when approaching N = 40. At this subshell closure a new region of deformation develops. From the experimental side, these nuclei can be populated by means of multi-nucleon and deep inelastic collisions. Recent results on the gamma-ray spectroscopy of the neutron-rich nuclei in this mass region are discussed. In particular, the evolution of the nuclear shape is studied in 65,67Co isotopes, populated by bombarding a 238U target with a 460 MeV 70Zn beam at the Legnaro National Laboratory. A shape-coexistence structure is observed in 67Co. The experimental results are interpreted within the shell model framework in a very large model space. These calculations are able to describe with good accuracy the excited states observed in 65,67Co, at the edge of the island of inversion at N=40.
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