arxiv: nucl-ex/0606033 · v1 · submitted 2006-06-26 · ⚛️ nucl-ex

Cross-shell excitation in two-proton knockout: Structure of ⁵²Ca

A. Gade , R. V. F. Janssens , D. Bazin , R. Broda , B. A. Brown , C. M. Campbell , M. P. Carpenter , J. M. Cook

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A. N. Deacon D.-C. Dinca B. Fornal S. J. Freeman T. Glasmacher P. G. Hansen B. P. Kay P. F. Mantica W. F. Mueller J. R. Terry J. A. Tostevin S. Zhu

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keywords cross-shelldirectknockoutstatetwo-protonbeenbesidesconfirms

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The two-proton knockout reaction $^9$Be($^{54}$Ti,$^{52}$Ca$ + \gamma$) has been studied at 72 MeV/nucleon. Besides the strong feeding of the $^{52}$Ca 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 $^{52}$Ca.

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Cross-shell excitation in two-proton knockout: Structure of ⁵²Ca

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