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The two-proton knockout reaction $^9$Be($^{54}$Ti,$^{52}$Ca$ + \gamma$) hasbeen studied at 72 MeV/nucleon. Besides the strong feeding of the $^{52}$Caground state, the only other sizeable cross section proceeds to a 3$^-$ levelat 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 reactionsfor exploring cross-shell proton excitations in neutron-rich nuclei andconfirms the doubly-magic nature of $^{52}$Ca

physical review. c. nuclear physics/physical review. c, nuclear physics

Cross-shell excitation in two-proton knockout: Structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Ca</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>52</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

Cross-shell excitation in two-proton knockout: Structure ofCa52