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Phys. Rev. Lett. 93, 042501 (2004) [4 pages]

Reduced Occupancy of the Deeply Bound 0d5/2 Neutron State in 32Ar

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A. Gade1, D. Bazin1, B. A. Brown1,2, C. M. Campbell1,2, J. A. Church1,2 *, D. C. Dinca1,2, J. Enders1 †, T. Glasmacher1,2, P. G. Hansen1,2 ‡, Z. Hu1, K. W. Kemper3, W. F. Mueller1, H. Olliver1,2, B. C. Perry1,2, L. A. Riley4, B. T. Roeder3, B. M. Sherrill1,2, J. R. Terry1,2, J. A. Tostevin5, and K. L. Yurkewicz1,2
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 and Astronomy, Ursinus College, Collegeville, Pennsylvania 19426, USA
5Department of Physics, School of Electronics and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom

Received 13 February 2004; published 19 July 2004

The 9Be(32Ar,31Ar)X reaction, leading to the 5 / 2+ ground state of a nucleus at the proton drip line, has a cross section of 10.4(13) mb at a beam energy of 65.1  MeV/nucleon. This translates into a spectroscopic factor that is only 24(3)% of that predicted by the many-body shell-model theory. We introduce refinements to the eikonal reaction theory used to extract the spectroscopic factor to clarify that this very strong reduction represents an effect of nuclear structure. We suggest that it reflects correlation effects linked to the high neutron separation energy (22.0 MeV) for this state.


©2004 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.93.042501
DOI: 10.1103/PhysRevLett.93.042501
PACS: 24.50.+g, 21.10.Jx, 27.30.+t

* Present address: Lawrence Livermore National Laboratory, Livermore, CA 94550.
† Present address: Institut für Kernphysik, Technische Universität Darmstadt, Germany.
‡ Electronic address: hansen@nscl.msu.edu

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