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

  • Author(s): Gade, A
  • Janssens, RVF
  • Bazin, D
  • Broda, R
  • Brown, BA
  • Campbell, CM
  • Carpenter, MP
  • Cook, JM
  • Deacon, AN
  • Dinca, D-C
  • Fornal, B
  • Freeman, SJ
  • Glasmacher, T
  • Hansen, PG
  • Kay, BP
  • Mantica, PF
  • Mueller, WF
  • Terry, JR
  • Tostevin, JA
  • Zhu, S
  • et al.
Abstract

The two-proton knockout reaction Be9(Ti54,Ca52+γ) has been studied at 72 MeV/nucleon. Besides the strong feeding of the Ca52 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 Ca52. © 2006 The American Physical Society.

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