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APS » Journals » Phys. Rev. Lett. » Volume 99 » Issue 7
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Phys. Rev. Lett. 99, 072502 (2007) [4 pages]

Spectroscopy of 36Mg: Interplay of Normal and Intruder Configurations at the Neutron-Rich Boundary of the “Island of Inversion”

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A. Gade1,2, P. Adrich1, D. Bazin1, M. D. Bowen1,2, B. A. Brown1,2, C. M. Campbell1,2, J. M. Cook1,2, S. Ettenauer1, T. Glasmacher1,2, K. W. Kemper3, S. McDaniel1,2, A. Obertelli1, T. Otsuka4,5, A. Ratkiewicz1,2, K. Siwek1,2, J. R. Terry1,2, J. A. Tostevin6, Y. Utsuno7, and D. Weisshaar1
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
3Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
4Department of Physics and Center for Nuclear Study, University of Tokyo, Hongo, Tokyo 113-0033, Japan
5RIKEN, Hirosawa, Wako-shi, Saitama 351-0198, Japan
6Department of Physics, School of Electronics and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
7Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan

Received 12 February 2007; published 17 August 2007

We report on the first spectroscopy study of the very neutron-rich nucleus 1236Mg24 using the direct two-proton knockout reaction 9Be(38Si,36Mg+γ)X at 83  MeV/nucleon. The energy of the first excited 2+ state of 36Mg, E(21+)=660(6)  keV, was measured. The magnitude of the partial cross sections to the ground state and the 21+ state is indicative of strong intruder admixtures in the lowest-lying states as suggested by Monte Carlo shell-model calculations.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.072502
DOI:
10.1103/PhysRevLett.99.072502
PACS:
23.20.Lv, 21.60.Cs, 25.60.Je, 27.30.+t
 
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