Abstract
The two-proton knockout reaction $^{9}\mathrm{Be}$($^{54}\mathrm{Ti}$,$^{52}\mathrm{Ca}+\ensuremath{\gamma}$) has been studied at 72 MeV/nucleon. Besides the strong feeding of the $^{52}\mathrm{Ca}$ ground state, the only other sizeable cross section proceeds to a ${3}^{\ensuremath{-}}$ 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 $^{52}\mathrm{Ca}$.
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