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Phys. Rev. C 71, 051301 (2005) [5 pages]

Knockout from 46Ar:ℓ=3 neutron removal and deviations from eikonal theory

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A. Gade1, D. Bazin1, C. A. Bertulani2 *, 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
2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824
3Department of Physics, Florida State University, Tallahassee, Florida 32306
4Department of Physics and Astronomy, Ursinus College, Collegeville, Pennsylvania 19426
5Department of Physics, School of Electronics and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom

Rapid Communication Received 1 December 2004; published 13 May 2005

The 9Be(46Ar,45Ar+γ)X one-neutron removal reaction has been studied in inverse kinematics at 70 MeV/nucleon. Coincidences with γ rays served to disentangle knockout events leading to the 45Ar ground state. The measured partial cross section corresponds to a spectroscopic factor of 4.9(7). The residue momentum distribution is compared with new calculations based on eikonal theory and represents the first case of an ℓ=3 neutron removal, as is expected for populating a 0f7/2 hole in the N=28 projectile. However, the measured 45Ar momentum distribution has a marked low-momentum tail suggestive of dissipative effects whereas the eikonal model predictions are symmetric. The angular distribution of the residues confirms that there is a deviation from the model.


©2005 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.71.051301
DOI: 10.1103/PhysRevC.71.051301
PACS: 24.50.+g, 21.10.Jx, 27.30.+t

* Present address: Department of Physics, University of Arizona, Tucson, AZ 85721.
† Present address: Lawrence Livermore National Laboratory, Livermore, CA 94550.
‡ Present address: Institut für Kernphysik, Technische Universität Darmstadt, Germany.

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