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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 :
AuthorsEmailORCID
Wilson, GLUNSPECIFIEDUNSPECIFIED
Catford, WNUNSPECIFIEDUNSPECIFIED
Orr, NAUNSPECIFIEDUNSPECIFIED
Diget, CUNSPECIFIEDUNSPECIFIED
Matta, AUNSPECIFIEDUNSPECIFIED
Hackman, GUNSPECIFIEDUNSPECIFIED
Williams, SJUNSPECIFIEDUNSPECIFIED
Celik, ICUNSPECIFIEDUNSPECIFIED
Achouri, NLUNSPECIFIEDUNSPECIFIED
Al Falou, HUNSPECIFIEDUNSPECIFIED
Ashley, RUNSPECIFIEDUNSPECIFIED
Austin, RAEUNSPECIFIEDUNSPECIFIED
Ball, GCUNSPECIFIEDUNSPECIFIED
Blackmon, JCUNSPECIFIEDUNSPECIFIED
Boston, AJUNSPECIFIEDUNSPECIFIED
Boston, HCUNSPECIFIEDUNSPECIFIED
Brown, SMUNSPECIFIEDUNSPECIFIED
Cross, DSUNSPECIFIEDUNSPECIFIED
Djongolov, MUNSPECIFIEDUNSPECIFIED
Drake, TEUNSPECIFIEDUNSPECIFIED
Hager, UUNSPECIFIEDUNSPECIFIED
Fox, SPUNSPECIFIEDUNSPECIFIED
Fulton, BRUNSPECIFIEDUNSPECIFIED
Galinski, NUNSPECIFIEDUNSPECIFIED
Garnsworthy, ABUNSPECIFIEDUNSPECIFIED
Jamieson, DUNSPECIFIEDUNSPECIFIED
Kanungo, RUNSPECIFIEDUNSPECIFIED
Leach, KGUNSPECIFIEDUNSPECIFIED
Orce, JNUNSPECIFIEDUNSPECIFIED
Pearson, CJUNSPECIFIEDUNSPECIFIED
Porter-Peden, MUNSPECIFIEDUNSPECIFIED
Sarazin, FUNSPECIFIEDUNSPECIFIED
Simpson, ECUNSPECIFIEDUNSPECIFIED
Sjue, SUNSPECIFIEDUNSPECIFIED
Smalley, DUNSPECIFIEDUNSPECIFIED
Sumithrarachchi, CUNSPECIFIEDUNSPECIFIED
Unsworth, CUNSPECIFIEDUNSPECIFIED
Triambak, SUNSPECIFIEDUNSPECIFIED
Wadsworth, RUNSPECIFIEDUNSPECIFIED
Date : 2 June 2016
Identification Number : 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 : 09 Jun 2016 09:41
URI: http://epubs.surrey.ac.uk/id/eprint/810972

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