Complete γ-spectroscopy of n-rich nuclei around 48Ca with Multi-Nucleon Transfer reactions

Abstract

The gamma decay of neutron-rich nuclei around 48Ca was measured at Legnaro National Laboratory with the PRISMA-CLARA setup, using the multi-nucleon transfer reaction 48Ca on 64Ni at 282 MeV. Evidence is found for a large spin alignment which allows to use angular distributions and polarizations of gamma rays to firmly establish, for the first time, spin and parities of several excited states. In the one neutron transfer channels, 49Ca and 47Ca, states arising by coupling a single particle to the 3− phonon of 48Ca are observed, showing the robustness of nuclear collectivity in rather light systems. The work demonstrates the feasibility of complete in-beam γ-spectroscopy with heavy-ion transfer reactions and provides a method that can be further exploited in the future with heavy targets and radioactive beams.