Neutron‐rich nuclei of the mass A = 60 region (from V to Fe) have been studied through multi‐nucleon transfer reactions by bombarding a 238U target with beams of 64Ni and 70Zn. Unambiguous identification of prompt γ rays belonging to each nucleus has been achieved by using the efficient gamma‐array CLARA coupled to the large‐acceptance magnetic spectrometer PRISMA installed at the Legnaro National Laboratories. With the new data, the existence of the N = 32 sub‐shell closure has been corroborated through the study of odd V isotopes, whereas a new region of deformation appears for neutron‐rich Fe nuclei close to N = 40. The results obtained for all these nuclei are compared with shell model calculations which reproduces quite well the experimental data also for the most neutron‐rich nuclei when excitations from the fp shell into the upper g9/2 orbital are allowed.
Spectroscopy of Neutron-rich Nuclei of the A60 region populated through binary heavy-ion collisions
LUNARDI, SANTO
2008
Abstract
Neutron‐rich nuclei of the mass A = 60 region (from V to Fe) have been studied through multi‐nucleon transfer reactions by bombarding a 238U target with beams of 64Ni and 70Zn. Unambiguous identification of prompt γ rays belonging to each nucleus has been achieved by using the efficient gamma‐array CLARA coupled to the large‐acceptance magnetic spectrometer PRISMA installed at the Legnaro National Laboratories. With the new data, the existence of the N = 32 sub‐shell closure has been corroborated through the study of odd V isotopes, whereas a new region of deformation appears for neutron‐rich Fe nuclei close to N = 40. The results obtained for all these nuclei are compared with shell model calculations which reproduces quite well the experimental data also for the most neutron‐rich nuclei when excitations from the fp shell into the upper g9/2 orbital are allowed.
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