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Narrowing of the neutron sd-pf shell gap in Na-29

Hurst, AM, Wu, CY, Becker, JA, Stoyer, MA, Pearson, CJ, Hackman, G, Schumaker, MA, Svensson, CE, Austin, RAE, Ball, GC , Bandyopadhyay, D, Barton, CJ, Boston, AJ, Boston, HC, Churchman, R, Cline, D, Colosimo, SJ, Cross, DS, Demand, G, Djongolov, M, Drake, TE, Garrett, PE, Gray-Jones, C, Green, KL, Grint, AN, Hayes, AB, Leach, KG, Kulp, WD, Lee, G, Lloyd, S, Maharaj, R, Martin, JP, Millar, BA, Mythili, S, Nelson, L, Nolan, PJ, Oxley, DC, Padilla-Rodal, E, Phillips, AA, Porter-Peden, M, Rigby, SV, Sarazin, F, Sumithrarachchi, CS, Triambak, S, Walker, PM, Williams, SJ, Wong, J and Wood, JL (2009) Narrowing of the neutron sd-pf shell gap in Na-29 PHYS LETT B, 674 (3). pp. 168-171.

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The wave-function composition for the low-lying states in Na-29 was explored by measuring their electromagnetic properties using the Coulomb-excitation technique. A beam of Na-29 ions, postaccelerated to 70 MeV, bombarded a Pd-110 target with a rate of up to 600 particles per second at the recently commissioned ISAC-II facility at TRIUMF. Six segmented HPGe clover detectors of the TIGRESS gamma-ray spectrometer were used to detect deexcitation gamma rays in coincidence with scattered or recoiling charged particles in the segmented silicon detector, BAMBINO. The reduced transition matrix element vertical bar < 5/2(1)(+)vertical bar vertical bar E2 vertical bar vertical bar 3/2(gs)(+)>vertical bar in Na-29 was derived to be 0.237(21) e b from the measured gamma-ray yields for both projectile and target. This first-time measured value is consistent with the most recent Monte Carlo shell-model calculation, indicating a significant admixture of both sd and pf components in the wave function, and also providing evidence for the narrowing of the neutron sd-pf shell gap from similar to 6 MeV for stable nuclei to similar to 3 MeV for Na-29. (C) 2009 Elsevier B.V. All rights reserved.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Hurst, AM
Wu, CY
Becker, JA
Stoyer, MA
Pearson, CJ
Hackman, G
Schumaker, MA
Svensson, CE
Austin, RAE
Ball, GC
Bandyopadhyay, D
Barton, CJ
Boston, AJ
Boston, HC
Churchman, R
Cline, D
Colosimo, SJ
Cross, DS
Demand, G
Djongolov, M
Drake, TE
Garrett, PE
Gray-Jones, C
Green, KL
Grint, AN
Hayes, AB
Leach, KG
Kulp, WD
Lee, G
Lloyd, S
Maharaj, R
Martin, JP
Millar, BA
Mythili, S
Nelson, L
Nolan, PJ
Oxley, DC
Padilla-Rodal, E
Phillips, AA
Porter-Peden, M
Rigby, SV
Sarazin, F
Sumithrarachchi, CS
Triambak, S
Walker, PM
Williams, SJ
Wong, J
Wood, JL
Date : 20 April 2009
DOI : 10.1016/j.physletb.2009.03.017
Uncontrolled Keywords : Coulomb excitation, ISOL, Reduced transition matrix element, Island of inversion, BETA-DECAY, MODEL, ISOTOPES, NUCLEI, SODIUM
Additional Information : NOTICE: this is the author’s version of a work that was accepted for publication in Physics Letters B. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Physics Letters B, 674 (3), April 2009, DOI 10.1016/j.physletb.2009.03.017.
Depositing User : Symplectic Elements
Date Deposited : 03 Dec 2011 12:20
Last Modified : 31 Oct 2017 14:13

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