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Shell evolution approaching the N = 20 island of inversion: Structure of 26Na

Wilson, GL, Catford, WN, Orr, NA, Diget, C, Matta, A, Hackman, G, Williams, SJ, Celik, IC, Achouri, NL, Al Falou, H , Ashley, R, Austin, RAE, Ball, GC, Blackmon, JC, Boston, AJ, Boston, HC, Brown, SM, Cross, DS, Djongolov, M, Drake, TE, Hager, U, Fox, SP, Fulton, BR, Galinski, N, Garnsworthy, AB, Jamieson, D, Kanungo, R, Leach, KG, Orce, JN, Pearson, CJ, Porter-Peden, M, Sarazin, F, Simpson, EC, Sjue, S, Smalley, D, Sumithrarachchi, C, Unsworth, C, Triambak, S and Wadsworth, R (2016) Shell evolution approaching the N = 20 island of inversion: Structure of 26Na Physics Letters B.

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Abstract

The levels in 26Na with single particle character have been observed for the first time using the d(25Na, pγ ) reaction at 5 MeV/nucleon. The measured excitation energies and the deduced spectroscopic factors are in good overall agreement with (0+1)ħω(0+1)ħω shell model calculations performed in a complete spsdfpspsdfp basis and incorporating a reduction in the N=20 gapN=20 gap. Notably, the 1p3/21p3/2 neutron configuration was found to play an enhanced role in the structure of the low-lying negative parity states in 26Na, compared to the isotone 28Al. Thus, the lowering of the 1p3/21p3/2 orbital relative to the 0f7/20f7/2 occurring in the neighbouring Z=10Z=10 and 12 nuclei – 25,27Ne and 27,29Mg – is seen also to occur at Z=11Z=11 and further strengthens the constraints on the modelling of the transition into the island of inversion.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors : Wilson, GL, Catford, WN, Orr, NA, Diget, C, Matta, A, Hackman, G, Williams, SJ, Celik, IC, Achouri, NL, Al Falou, H, Ashley, R, Austin, RAE, Ball, GC, Blackmon, JC, Boston, AJ, Boston, HC, Brown, SM, Cross, DS, Djongolov, M, Drake, TE, Hager, U, Fox, SP, Fulton, BR, Galinski, N, Garnsworthy, AB, Jamieson, D, Kanungo, R, Leach, KG, Orce, JN, Pearson, CJ, Porter-Peden, M, Sarazin, F, Simpson, EC, Sjue, S, Smalley, D, Sumithrarachchi, C, Unsworth, C, Triambak, S and Wadsworth, R
Date : 2 June 2016
DOI : 10.1016/j.physletb.2016.05.093
Copyright Disclaimer : © 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 08 Jun 2016 09:36
Last Modified : 21 Oct 2019 12:19
URI: http://epubs.surrey.ac.uk/id/eprint/810972

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