Spectroscopy of Mg36: Interplay of Normal and Intruder Configurations at the Neutron-Rich Boundary of the “Island of Inversion”

A. Gade, P. Adrich, D. Bazin, M. D. Bowen, B. A. Brown, C. M. Campbell, J. M. Cook, S. Ettenauer, T. Glasmacher, K. W. Kemper, S. McDaniel, A. Obertelli, T. Otsuka, A. Ratkiewicz, K. Siwek, J. R. Terry, J. A. Tostevin, Y. Utsuno, and D. Weisshaar
Phys. Rev. Lett. 99, 072502 – Published 17 August 2007

Abstract

We report on the first spectroscopy study of the very neutron-rich nucleus Mg241236 using the direct two-proton knockout reaction Be9(Si38,Mg36+γ)X at 83MeV/nucleon. The energy of the first excited 2+ state of Mg36, 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.

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  • Received 12 February 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.072502

©2007 American Physical Society

Authors & Affiliations

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

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Issue

Vol. 99, Iss. 7 — 17 August 2007

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