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Phys. Rev. C 79, 051303(R) (2009) [4 pages]

Selectivity of the one-neutron knockout reaction on 45Cl and the collapse of the N=28 shell closure

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L. A. Riley1, P. Adrich2, T. R. Baugher2, D. Bazin2, B. A. Brown2,3, J. M. Cook2,3, P. D. Cottle4, C. Aa. Diget2, A. Gade2,3, D. A. Garland2,3, T. Glasmacher2,3, B. A. Hartl1, K. E. Hosier1, K. W. Kemper4, A. Ratkiewicz2,3, K. P. Siwek2,3, D. C. Stoken1, J. A. Tostevin5, and D. Weisshaar2
1Department of Physics and Astronomy, Ursinus College, Collegeville, Pennsylvania 19426, USA
2National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
3Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
4Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
5Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom

Received 22 April 2009; published 22 May 2009

Neutron hole states in the exotic N=27 isotope 44Cl have been populated using the intermediate-energy single-neutron knockout reaction 9Be(45Cl,44Cl)X. The momentum distribution of the residual 44Cl nuclei after direct population of the ground state is consistent with removal of an l=1 neutron. This observation and comparison with a shell-model calculation imply that p3/2 neutrons from above the N=28 major shell closure play important roles in the ground states of both 44Cl and 45Cl. The present result is significant because 44Cl is even closer to the valley of stability than 43S, where a similar result was recently obtained using a g-factor measurement.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.79.051303
DOI:
10.1103/PhysRevC.79.051303
PACS:
24.50.+g, 21.10.Jx, 25.60.Gc, 27.40.+z