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Low-lying neutron f p-shell intruder states in Ne-27

Brown, SM, Catford, WN, Thomas, JS, Fernandez-Dominguez, B, Orr, NA, Labiche, M, Rejmund, M, Achouri, NL, Al Falou, H, Ashwood, NI, Beaumel, D, Blumenfeld, Y, Brown, BA, Chapman, R, Chartier, M, Curtis, N, de France, G, de Sereville, N, Delaunay, F, Drouart, A, Force, C, Franchoo, S, Guillot, J, Haigh, P, Hammache, F, Lapoux, V, Lemmon, RC, Leprince, A, Marechal, F, Mougeot, X, Mouginot, B, Nalpas, L, Navin, A, Patterson, NP, Pietras, B, Pollacco, EC, Ramus, A, Scarpaci, JA, Stefan, I and Wilson, GL (2012) Low-lying neutron f p-shell intruder states in Ne-27 PHYSICAL REVIEW C, 85. ISSN 0556-2813

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Abstract

The quenching of the N=20 shell gap in neutron-rich nuclei is investigated by studying the single-particle structure of 27Ne via neutron transfer using a 26Ne beam. Two low-lying negative-parity intruder states have been observed, the lowest of which is identified as Jπ=3/2−, confirming earlier speculations. A level identified as 7/2− is observed higher in energy than the 3/2−, contrary to the ordering at β-stability and at an energy significantly different from the predictions of previous shell-model calculations. The measured energies and deduced spectroscopic factors are well reproduced in full (0,1)-ℏω 0s-0p-0d-1s-0f-1p calculations in which there is a significant ad hoc reduction (∼0.7 MeV) in the N=20 shell gap.

Item Type: Article
Additional Information: Copyright 2012The American Physical Society.
Related URLs:
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Symplectic Elements
Date Deposited: 11 Jun 2012 15:34
Last Modified: 23 Sep 2013 19:29
URI: http://epubs.surrey.ac.uk/id/eprint/576995

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