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Direct evidence for the breakdown of the N=8 shell closure in Be-12

Navin, A, Anthony, DW, Aumann, T, Baumann, T, Bazin, D, Blumenfeld, Y, Brown, BA, Glasmacher, T, Hansen, PG, Ibbotson, RW, Lofy, PA, Maddalena, V, Miller, K, Nakamura, T, Pritychenko, BV, Sherrill, BM, Spears, E, Steiner, M, Tostevin, JA, Yurkon, J and Wagner, A (2000) Direct evidence for the breakdown of the N=8 shell closure in Be-12 PHYS REV LETT, 85 (2). 266 - 269. ISSN 0031-9007

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Abstract

Partial cross sections and corresponding momentum distributions have been studied in the one-neutron knockout reaction (12Be, 11Be 1 g) on a 9Be target at 78 MeVnucleon. The resulting spectroscopic factors for the only two bound states of 11Be are 0.42 6 0.06 (121) and 0.37 6 0.06 (122), where the errors are experimental only. This result shows that N 8 is not a good closed shell in the neutronrich 12Be and that the last neutron pair is two-thirds in the (1s2 1 0d2) intruder configuration.

Item Type: Article
Uncontrolled Keywords: CORE EXCITATION, STATES, TRANSITIONS, BEAMS, LI-11
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Symplectic Elements
Date Deposited: 16 Nov 2011 09:25
Last Modified: 23 Sep 2013 18:48
URI: http://epubs.surrey.ac.uk/id/eprint/7465

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