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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
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmail
Brown, SMUNSPECIFIED
Catford, WNUNSPECIFIED
Thomas, JSUNSPECIFIED
Fernandez-Dominguez, BUNSPECIFIED
Orr, NAUNSPECIFIED
Labiche, MUNSPECIFIED
Rejmund, MUNSPECIFIED
Achouri, NLUNSPECIFIED
Al Falou, HUNSPECIFIED
Ashwood, NIUNSPECIFIED
Beaumel, DUNSPECIFIED
Blumenfeld, YUNSPECIFIED
Brown, BAUNSPECIFIED
Chapman, RUNSPECIFIED
Chartier, MUNSPECIFIED
Curtis, NUNSPECIFIED
de France, GUNSPECIFIED
de Sereville, NUNSPECIFIED
Delaunay, FUNSPECIFIED
Drouart, AUNSPECIFIED
Force, CUNSPECIFIED
Franchoo, SUNSPECIFIED
Guillot, JUNSPECIFIED
Haigh, PUNSPECIFIED
Hammache, FUNSPECIFIED
Lapoux, VUNSPECIFIED
Lemmon, RCUNSPECIFIED
Leprince, AUNSPECIFIED
Marechal, FUNSPECIFIED
Mougeot, XUNSPECIFIED
Mouginot, BUNSPECIFIED
Nalpas, LUNSPECIFIED
Navin, AUNSPECIFIED
Patterson, NPUNSPECIFIED
Pietras, BUNSPECIFIED
Pollacco, ECUNSPECIFIED
Ramus, AUNSPECIFIED
Scarpaci, JAUNSPECIFIED
Stefan, IUNSPECIFIED
Wilson, GLUNSPECIFIED
Date : 23 January 2012
Identification Number : 10.1103/PhysRevC.85.011302
Related URLs :
Additional Information : Copyright 2012The American Physical Society.
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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