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Single-Neutron Knockout from Intermediate Energy Beams of Mg-30,Mg-32: 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 Mg-30,Mg-32: Mapping the Transition into the "Island of Inversion" Physical Review C, 77 (1). ISSN 0556-2813

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Abstract

The breakdown of the N=20 magic number in the so-called island of inversion around Mg-32 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 Mg-30 and Mg-32, with the latter consisting nearly purely of 2p-2h N=20 cross-shell configurations. Single-neutron knockout experiments on Mg-30,Mg-32 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 <i>Physical Review C,</i> Vol. 77, Iss. 1. Copyright 2008 American Physical Society. Click <a href=http://prc.aps.org/>here</a> to access the journal's website.
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:05
Last Modified: 23 Sep 2013 18:25
URI: http://epubs.surrey.ac.uk/id/eprint/20

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