Thick-target inverse-kinematics proton scattering from Ar46 and the N=28 shell below Ca48

L. A. Riley, M. A. Abdelqader, D. Bazin, M. J. Bojazi, B. A. Brown, C. M. Campbell, J. A. Church, P. D. Cottle, D. -C. Dinca, J. Enders, A. Gade, T. Glasmacher, M. Honma, S. Horibe, Z. Hu, K. W. Kemper, W. F. Mueller, H. Olliver, T. Otsuka, B. C. Perry, B. T. Roeder, B. M. Sherrill, T. P. Spencer, and J. R. Terry
Phys. Rev. C 72, 024311 – Published 17 August 2005

Abstract

Low-lying excited states of Ar46 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 Ca48. The status of the N=28 shell below Ca48 is discussed.

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  • Received 28 March 2005

DOI:https://doi.org/10.1103/PhysRevC.72.024311

©2005 American Physical Society

Authors & Affiliations

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

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

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Vol. 72, Iss. 2 — August 2005

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