Measurement of Excited States in Si40 and Evidence for Weakening of the N=28 Shell Gap

C. M. Campbell, N. Aoi, D. Bazin, M. D. Bowen, B. A. Brown, J. M. Cook, D.-C. Dinca, A. Gade, T. Glasmacher, M. Horoi, S. Kanno, T. Motobayashi, W. F. Mueller, H. Sakurai, K. Starosta, H. Suzuki, S. Takeuchi, J. R. Terry, K. Yoneda, and H. Zwahlen
Phys. Rev. Lett. 97, 112501 – Published 13 September 2006

Abstract

Excited states in Si40 have been established by detecting γ rays coincident with inelastic scattering and nucleon removal reactions on a liquid hydrogen target. The low excitation energy, 986(5) keV, of the 21+ state provides evidence of a weakening in the N=28 shell closure in a neutron-rich nucleus devoid of deformation-driving proton collectivity.

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  • Received 19 June 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.112501

©2006 American Physical Society

Authors & Affiliations

C. M. Campbell1,2, N. Aoi3, D. Bazin1, M. D. Bowen1,2, B. A. Brown1,2, J. M. Cook1,2, D.-C. Dinca1,2, A. Gade1,2, T. Glasmacher1,2, M. Horoi4, S. Kanno5, T. Motobayashi3, W. F. Mueller1, H. Sakurai3, K. Starosta1,2, H. Suzuki6, S. Takeuchi3, J. R. Terry1,2, K. Yoneda3, and H. Zwahlen1,2

  • 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
  • 3The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 4Physics Department, Central Michigan University, Mount Pleasant, Michigan 48859, USA
  • 5Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
  • 6Department of Physics, University of Tokyo, Tokyo 1130033, Japan

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Vol. 97, Iss. 11 — 15 September 2006

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