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Phys. Rev. C 72, 024311 (2005) [7 pages]

Thick-target inverse-kinematics proton scattering from 46Ar and the N=28 shell below 48Ca

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L. A. Riley1, M. A. Abdelqader1, D. Bazin2, M. J. Bojazi1, B. A. Brown2,3, C. M. Campbell2,3, J. A. Church2,3 *, P. D. Cottle4, D. -C. Dinca2,3, J. Enders2 †, A. Gade2, T. Glasmacher2,3, M. Honma5, S. Horibe6, Z. Hu2, K. W. Kemper4, W. F. Mueller2, H. Olliver2,3, T. Otsuka7,8, B. C. Perry2,3, B. T. Roeder4, B. M. Sherrill2,3, T. P. Spencer1, and J. R. Terry2,3
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
5Center for Mathematical Sciences, University of Aizu, Tsuruga, Ikki-machi, Aizu-Wakamatsu, Fukushima 965-8580, Japan
6Department of Physics and Astronomy, Earlham College, Richmond, Indiana 47374, USA
7Department of Physics and Center for Nuclear Study, University of Tokyo, Hongo, Tokyo 113-0033, Japan
8RIKEN, Hirosawa, Wako-shi, Saitama 351-0198, Japan

Received 28 March 2005; published 17 August 2005

Low-lying excited states of 46Ar have been studied via inverse-kinematics proton scattering with a thick target. Coupled-channels calculations have been used to extract the deformation length of the 21+ state. This result, combined with existing Coulomb excitation data, yields a ratio of the neutron-to-proton transition matrix elements of Mn/Mp=1.19(25)N/Z, showing a departure from the proton dominance observed in the N=28 isotones above 48Ca. The status of the N=28 shell below 48Ca is discussed.


©2005 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.72.024311
DOI: 10.1103/PhysRevC.72.024311
PACS: 25.40.Ep, 21.10.Re

* Present address: Lawrence Livermore National Laboratory, Livermore, CA 94550.
† Present address: Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany.

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