Cross-shell excitation in two-proton knockout: Structure of 52Ca
Abstract
The two-proton knockout reaction 9Be(54Ti,52Ca + γ) has been studied at 72 MeV/nucleon. Besides the strong feeding of the 52Ca ground state, the only other sizeable cross section proceeds to a 3- level at 3.9 MeV. There is no measurable direct yield to the first excited 2+ state at 2.6 MeV. The results illustrate the potential of such direct reactions for exploring cross-shell proton excitations in neutron-rich nuclei and confirms the doubly-magic nature of 52Ca.
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