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Single-neutron knockout from intermediate energy beams of 30,32Mg: Mapping the transition into the “island of inversion”

Terry, J. R., Brown, B. A., Campbell, C. M., Cook, J. M., Davies, A. D., Dinca, D.-C., Gade, A., Glasmacher, T., Hansen, P. G., Sherrill, B. M., Zwahlen, H., Bazin, D., Yoneda, K., Tostevin, J. A., Otsuka, T., Utsuno, Y. and Pritychenko, B. (2008) Single-neutron knockout from intermediate energy beams of 30,32Mg: Mapping the transition into the “island of inversion” Physical Review C, 77 (014316). ISSN 0556-2813

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Abstract

The breakdown of the N=20 magic number in the so-called island of inversion around 32Mg is well established. Recently developed large-scale shell-model calculations suggest a transitional region between normal- and intruder-dominated nuclear ground states, thus modifying the boundary of the island of inversion. In particular, a dramatic change in single-particle structure is predicted between the ground states of 30Mg and 32Mg, with the latter consisting nearly purely of 2p-2h N=20 cross-shell configurations. Single-neutron knockout experiments on 30Mg and 32Mg projectiles have been performed. We report on a first direct observation of intruder configurations in the ground states of these very neutron-rich nuclei. Spectroscopic factors to low-lying negative-parity states in the knockout residues are deduced and compare well with shell-model predictions.

Item Type: Article
Additional Information: Published in Physical Review C, 77, 014316 (2008). © 2008 The American Physical Society.
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:07
Last Modified: 23 Sep 2013 18:27
URI: http://epubs.surrey.ac.uk/id/eprint/279

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