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Phys. Rev. C 74, 021302(R) (2006) [4 pages]

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

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A. Gade1,2, R. V. F. Janssens3, D. Bazin1, R. Broda4, B. A. Brown1,2, C. M. Campbell1,2, M. P. Carpenter3, J. M. Cook1,2, A. N. Deacon5, D.-C. Dinca1,2, B. Fornal4, S. J. Freeman5, T. Glasmacher1,2, P. G. Hansen1,2, B. P. Kay5, P. F. Mantica1,6, W. F. Mueller1, J. R. Terry1,2, J. A. Tostevin7, and S. Zhu3
1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
3Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
4Institute of Nuclear Physics, Polish Academy of Science, PL-31342 Cracow, Poland
5School of Physics and Astronomy, Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom
6Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
7Department of Physics, School of Electronics and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom

Received 23 March 2006; published 16 August 2006

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.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.74.021302
DOI:
10.1103/PhysRevC.74.021302
PACS:
24.50.+g, 21.60.Cs, 23.20.Lv, 27.40.+z
 
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