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Phys. Rev. C 73, 044605 (2006) [5 pages]

Population of bound excited states in intermediate-energy fragmentation reactions

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A. Obertelli1, A. Gade1, D. Bazin1, C. M. Campbell1,2, J. M. Cook1,2, P. D. Cottle3, A. D. Davies1,2, D.-C. Dinca1,2,*, T. Glasmacher1,2, P. G. Hansen1, T. Hoagland1, K. W. Kemper3, J.-L. Lecouey1,†, W. F. Mueller1, R. R. Reynolds3, B. T. Roeder3, J. R. Terry1,2, J. A. Tostevin4, K. Yoneda1,‡, and H. Zwahlen1,2
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
3Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
4Department of Physics, School of Electronics and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom

Received 21 January 2006; published 6 April 2006

Fragmentation reactions with intermediate-energy heavy-ion beams exhibit a wide range of reaction mechanisms, ranging from direct reactions to statistical processes. We examine this transition by measuring the relative population of excited states in several sd-shell nuclei produced by fragmentation with the number of removed nucleons ranging from two to sixteen. The two-nucleon removal is consistent with a non-dissipative process, whereas the removal of more than five nucleons appears to be mainly statistical.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.73.044605
DOI:
10.1103/PhysRevC.73.044605
PACS:
25.60.-t, 25.70.Mn, 27.30.+t

*Present address: American Science & Engineering, Inc., 829 Middlesex Turnpike, Billerica, Massachusetts 01821, USA.

†Present address: Laboratoire de Physique Corpusculaire, 6 Boulevard du maréchal Juin, 14050 Caen Cedex, France.

‡Present address: RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan.

 
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