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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, 011302.

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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 :
AuthorsEmailORCID
Brown, SMUNSPECIFIEDUNSPECIFIED
Catford, WNUNSPECIFIEDUNSPECIFIED
Thomas, JSUNSPECIFIEDUNSPECIFIED
Fernandez-Dominguez, BUNSPECIFIEDUNSPECIFIED
Orr, NAUNSPECIFIEDUNSPECIFIED
Labiche, MUNSPECIFIEDUNSPECIFIED
Rejmund, MUNSPECIFIEDUNSPECIFIED
Achouri, NLUNSPECIFIEDUNSPECIFIED
Al Falou, HUNSPECIFIEDUNSPECIFIED
Ashwood, NIUNSPECIFIEDUNSPECIFIED
Beaumel, DUNSPECIFIEDUNSPECIFIED
Blumenfeld, YUNSPECIFIEDUNSPECIFIED
Brown, BAUNSPECIFIEDUNSPECIFIED
Chapman, RUNSPECIFIEDUNSPECIFIED
Chartier, MUNSPECIFIEDUNSPECIFIED
Curtis, NUNSPECIFIEDUNSPECIFIED
de France, GUNSPECIFIEDUNSPECIFIED
de Sereville, NUNSPECIFIEDUNSPECIFIED
Delaunay, FUNSPECIFIEDUNSPECIFIED
Drouart, AUNSPECIFIEDUNSPECIFIED
Force, CUNSPECIFIEDUNSPECIFIED
Franchoo, SUNSPECIFIEDUNSPECIFIED
Guillot, JUNSPECIFIEDUNSPECIFIED
Haigh, PUNSPECIFIEDUNSPECIFIED
Hammache, FUNSPECIFIEDUNSPECIFIED
Lapoux, VUNSPECIFIEDUNSPECIFIED
Lemmon, RCUNSPECIFIEDUNSPECIFIED
Leprince, AUNSPECIFIEDUNSPECIFIED
Marechal, FUNSPECIFIEDUNSPECIFIED
Mougeot, XUNSPECIFIEDUNSPECIFIED
Mouginot, BUNSPECIFIEDUNSPECIFIED
Nalpas, LUNSPECIFIEDUNSPECIFIED
Navin, AUNSPECIFIEDUNSPECIFIED
Patterson, NPUNSPECIFIEDUNSPECIFIED
Pietras, BUNSPECIFIEDUNSPECIFIED
Pollacco, ECUNSPECIFIEDUNSPECIFIED
Ramus, AUNSPECIFIEDUNSPECIFIED
Scarpaci, JAUNSPECIFIEDUNSPECIFIED
Stefan, IUNSPECIFIEDUNSPECIFIED
Wilson, GLUNSPECIFIEDUNSPECIFIED
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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