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Phys. Rev. Lett. 97, 112501 (2006) [4 pages]

Measurement of Excited States in 40Si and Evidence for Weakening of the N=28 Shell Gap

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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

Received 19 June 2006; published 13 September 2006

Excited states in 40Si 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.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.112501
DOI:
10.1103/PhysRevLett.97.112501
PACS:
23.20.Lv, 21.10.Pc, 25.40.−h, 27.40.+z
 
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