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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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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 :
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
Wilson, GL
Date : 23 January 2012
DOI : 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 : 31 Oct 2017 14:37

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