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

G. L. Wilson; W. N. Catford; N. A. Orr; C. Aa Diget; A. Matta; G. Hackman; S. J. Williams; I. C. Celik; N. L. Achouri; H. Al Falou; R. Ashley; R. A E Austin; G. C. Ball; J. C. Blackmon; A. J. Boston; H. C. Boston; S. M. Brown; D. S. Cross; M. Djongolov; T. E. Drake; U. Hager; S. P. Fox; B. R. Fulton; N. Galinski; A. B. Garnsworthy; D. Jamieson; R. Kanungo; K. G. Leach; J. N. Orce; C. J. Pearson; M. Porter-Peden; F. Sarazin; E. C. Simpson; S. Sjue; D. Smalley; C. Sumithrarachchi; S. Triambak; C. Unsworth; R. Wadsworth

doi:10.1016/j.physletb.2016.05.093

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

G. L. Wilson, W. N. Catford^*, N. A. Orr, C. Aa Diget, A. Matta, G. Hackman, S. J. Williams, I. C. Celik, N. L. Achouri, H. Al Falou, R. Ashley, R. A E Austin, G. C. Ball, J. C. Blackmon, A. J. Boston, H. C. Boston, S. M. Brown, D. S. Cross, M. Djongolov, T. E. DrakeU. Hager, S. P. Fox, B. R. Fulton, N. Galinski, A. B. Garnsworthy, D. Jamieson, R. Kanungo, K. G. Leach, J. N. Orce, C. J. Pearson, M. Porter-Peden, F. Sarazin, E. C. Simpson, S. Sjue, D. Smalley, C. Sumithrarachchi, S. Triambak, C. Unsworth, R. Wadsworth

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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)hω shell model calculations performed in a complete spsdfp basis and incorporating a reduction in the N=20 gap. Notably, the 1p_3/2 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 1p_3/2 orbital relative to the 0f_7/2 occurring in the neighbouring Z=10 and 12 nuclei - ^25,27Ne and ^27,29Mg - is seen also to occur at Z=11 and further strengthens the constraints on the modelling of the transition into the island of inversion.

Original language	English
Pages (from-to)	417-423
Number of pages	7
Journal	Physics Letters B
Volume	759
Early online date	2 Jun 2016
DOIs	https://doi.org/10.1016/j.physletb.2016.05.093
Publication status	Published - 10 Aug 2016

Keywords

81V35
Na
Nuclear structure
Shell migration
Transfer reactions
γ-Ray transitions

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10.1016/j.physletb.2016.05.093

1s20S0370269316302489mainFinal published version, 1.77 MBLicence: CC BY

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Wilson, G. L., Catford, W. N., Orr, N. A., Diget, C. A., Matta, A., Hackman, G., Williams, S. J., Celik, I. C., Achouri, N. L., Al Falou, H., Ashley, R., Austin, R. A. E., Ball, G. C., Blackmon, J. C., Boston, A. J., Boston, H. C., Brown, S. M., Cross, D. S., Djongolov, M., ... Wadsworth, R. (2016). Shell evolution approaching the N=20 island of inversion: Structure of ²⁶Na. Physics Letters B, 759, 417-423. https://doi.org/10.1016/j.physletb.2016.05.093

@article{12b0a59c4788430abfeb79cd20cc161d,

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

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)hω shell model calculations performed in a complete spsdfp basis and incorporating a reduction in the N=20 gap. Notably, the 1p3/2 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 1p3/2 orbital relative to the 0f7/2 occurring in the neighbouring Z=10 and 12 nuclei - 25,27Ne and 27,29Mg - is seen also to occur at Z=11 and further strengthens the constraints on the modelling of the transition into the island of inversion.",

keywords = "81V35, Na, Nuclear structure, Shell migration, Transfer reactions, γ-Ray transitions",

author = "Wilson, {G. L.} and Catford, {W. N.} and Orr, {N. A.} and Diget, {C. Aa} and A. Matta and G. Hackman and Williams, {S. J.} and Celik, {I. C.} and Achouri, {N. L.} and {Al Falou}, H. and R. Ashley and Austin, {R. A E} and Ball, {G. C.} and Blackmon, {J. C.} and Boston, {A. J.} and Boston, {H. C.} and Brown, {S. M.} and Cross, {D. S.} and M. Djongolov and Drake, {T. E.} and U. Hager and Fox, {S. P.} and Fulton, {B. R.} and N. Galinski and Garnsworthy, {A. B.} and D. Jamieson and R. Kanungo and Leach, {K. G.} and Orce, {J. N.} and Pearson, {C. J.} and M. Porter-Peden and F. Sarazin and Simpson, {E. C.} and S. Sjue and D. Smalley and C. Sumithrarachchi and S. Triambak and C. Unsworth and R. Wadsworth",

year = "2016",

month = aug,

day = "10",

doi = "10.1016/j.physletb.2016.05.093",

language = "English",

volume = "759",

pages = "417--423",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

}

Wilson, GL, Catford, WN, Orr, NA, Diget, CA, 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, Triambak, S, Unsworth, C & Wadsworth, R 2016, 'Shell evolution approaching the N=20 island of inversion: Structure of ²⁶Na', Physics Letters B, vol. 759, pp. 417-423. https://doi.org/10.1016/j.physletb.2016.05.093

TY - JOUR

T1 - Shell evolution approaching the N=20 island of inversion

T2 - Structure of 26Na

AU - Wilson, G. L.

AU - Catford, W. N.

AU - Orr, N. A.

AU - Diget, C. Aa

AU - Matta, A.

AU - Hackman, G.

AU - Williams, S. J.

AU - Celik, I. C.

AU - Achouri, N. L.

AU - Al Falou, H.

AU - Ashley, R.

AU - Austin, R. A E

AU - Ball, G. C.

AU - Blackmon, J. C.

AU - Boston, A. J.

AU - Boston, H. C.

AU - Brown, S. M.

AU - Cross, D. S.

AU - Djongolov, M.

AU - Drake, T. E.

AU - Hager, U.

AU - Fox, S. P.

AU - Fulton, B. R.

AU - Galinski, N.

AU - Garnsworthy, A. B.

AU - Jamieson, D.

AU - Kanungo, R.

AU - Leach, K. G.

AU - Orce, J. N.

AU - Pearson, C. J.

AU - Porter-Peden, M.

AU - Sarazin, F.

AU - Simpson, E. C.

AU - Sjue, S.

AU - Smalley, D.

AU - Sumithrarachchi, C.

AU - Triambak, S.

AU - Unsworth, C.

AU - Wadsworth, R.

PY - 2016/8/10

Y1 - 2016/8/10

N2 - 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)hω shell model calculations performed in a complete spsdfp basis and incorporating a reduction in the N=20 gap. Notably, the 1p3/2 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 1p3/2 orbital relative to the 0f7/2 occurring in the neighbouring Z=10 and 12 nuclei - 25,27Ne and 27,29Mg - is seen also to occur at Z=11 and further strengthens the constraints on the modelling of the transition into the island of inversion.

AB - 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)hω shell model calculations performed in a complete spsdfp basis and incorporating a reduction in the N=20 gap. Notably, the 1p3/2 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 1p3/2 orbital relative to the 0f7/2 occurring in the neighbouring Z=10 and 12 nuclei - 25,27Ne and 27,29Mg - is seen also to occur at Z=11 and further strengthens the constraints on the modelling of the transition into the island of inversion.

KW - 81V35

KW - Na

KW - Nuclear structure

KW - Shell migration

KW - Transfer reactions

KW - γ-Ray transitions

UR - http://www.scopus.com/inward/record.url?scp=84973497160&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2016.05.093

DO - 10.1016/j.physletb.2016.05.093

M3 - Article

AN - SCOPUS:84973497160

SN - 0370-2693

VL - 759

SP - 417

EP - 423

JO - Physics Letters B

JF - Physics Letters B

ER -

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

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Nuclear Physics Consolidated Grant

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

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Nuclear Physics Consolidated Grant

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