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Phys. Rev. C 77, 034310 (2008) [8 pages]

Excited intruder states in 32Mg

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Vandana Tripathi, S. L. Tabor, P. Bender, C. R. Hoffman, Sangjin Lee, K. Pepper, and M. Perry
Department of Physics, Florida State University, Tallahassee, Florida 32306, USA

P. F. Mantica1,2, J. M. Cook1,3, J. Pereira1, J. S. Pinter1,2, J. B. Stoker1,2, and D. Weisshaar1
1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
2Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
3Department of Physics, Michigan State University, East Lansing, Michigan 48824, USA

Y. Utsuno
Advanced Science Research Centre, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan

T. Otsuka
Department of Physics and Center for Nuclear Study, University of Tokyo, Hongo, Tokyo 113-0033, Japan and RIKEN, Hirosawa, Wako-shi, Saitama 351-0198, Japan

Received 13 December 2007; published 24 March 2008

The low energy level structure of N=20 32Mg obtained via β-delayed γ spectroscopy is reported. The level structure of 32Mg is found to be completely dominated by intruders. An inversion between the 1p-1h and 3p-3h states is observed for the negative parity states, similar to the 0p-0h and 2p-2h inversion for the positive parity states in these N~20 nuclei. The intruder excited states, both positive and negative parity, are reasonably explained by Monte Carlo shell model calculations, which suggest a shrinking N=20 shell gap with decreasing Z.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.77.034310
DOI:
10.1103/PhysRevC.77.034310
PACS:
23.40.-s, 21.60.Cs, 23.20.Lv, 27.30.+t
 
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