Shape polarization in the tin isotopes near N = 60 from precision g-factor measurements on short-lived 11/2− isomers

T.J. Gray; A.E. Stuchbery; J. Dobaczewski; A. Blazhev; H.A. Alshammari; L.J. Bignell; J. Bonnard; B.J. Coombes; J.T.H. Dowie; M.S.M. Gerathy; T. Kibédi; G.J. Lane; B.P. McCormick; A.J. Mitchell; C. Nicholls; J.G. Pope; P.-G. Reinhard; N.J. Spinks; Y. Zhong

Physics Letters B (Dec 2023)

Shape polarization in the tin isotopes near N = 60 from precision g-factor measurements on short-lived 11/2− isomers

T.J. Gray,
A.E. Stuchbery,
J. Dobaczewski,
A. Blazhev,
H.A. Alshammari,
L.J. Bignell,
J. Bonnard,
B.J. Coombes,
J.T.H. Dowie,
M.S.M. Gerathy,
T. Kibédi,
G.J. Lane,
B.P. McCormick,
A.J. Mitchell,
C. Nicholls,
J.G. Pope,
P.-G. Reinhard,
N.J. Spinks,
Y. Zhong

Affiliations

T.J. Gray: Department of Nuclear Physics and Accelerator Applications, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia; Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; Corresponding author.
A.E. Stuchbery: Department of Nuclear Physics and Accelerator Applications, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
J. Dobaczewski: School of Physics, Engineering and Technology, University of York, York YO10 5DD, United Kingdom; Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, PL-02-093 Warsaw, Poland
A. Blazhev: Institut für Kernphysik, Universität zu Köln, Zülpicher Sraße 77, D-50937, Köln, Germany
H.A. Alshammari: Department of Nuclear Physics and Accelerator Applications, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia; College of Science and Arts in Turaif, Physics Department, Northern Border University, Saudi Arabia
L.J. Bignell: Department of Nuclear Physics and Accelerator Applications, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
J. Bonnard: School of Physics, Engineering and Technology, University of York, York YO10 5DD, United Kingdom; Université de Lyon, Institut de Physique des 2 Infinis de Lyon, IN2P3-CNRS-UCBL, 4 rue Enrico Fermi, 69622 Villeurbanne, France
B.J. Coombes: Department of Nuclear Physics and Accelerator Applications, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
J.T.H. Dowie: Department of Nuclear Physics and Accelerator Applications, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
M.S.M. Gerathy: Department of Nuclear Physics and Accelerator Applications, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
T. Kibédi: Department of Nuclear Physics and Accelerator Applications, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
G.J. Lane: Department of Nuclear Physics and Accelerator Applications, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
B.P. McCormick: Department of Nuclear Physics and Accelerator Applications, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
A.J. Mitchell: Department of Nuclear Physics and Accelerator Applications, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
C. Nicholls: Department of Nuclear Physics and Accelerator Applications, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
J.G. Pope: Department of Nuclear Physics and Accelerator Applications, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
P.-G. Reinhard: Institut für Theoretische Physik II, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
N.J. Spinks: Department of Nuclear Physics and Accelerator Applications, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
Y. Zhong: Department of Nuclear Physics and Accelerator Applications, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia

Journal volume & issue: Vol. 847
p. 138268

Abstract

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The g factors of 11/2− isomers in semimagic 109Sn and 111Sn (isomeric lifetimes τ=2.9(3) ns and τ=14.4(7) ns, respectively) were measured by an extension of the Time Differential Perturbed Angular Distribution technique, which uses LaBr3 detectors and the hyperfine fields of a gadolinium host to achieve precise measurements in a new regime of short-lived isomers. The results, g(11/2−;109Sn)=−0.186(8) and g(11/2−;111Sn)=−0.214(4), are significantly lower in magnitude than those of the 11/2− isomers in the heavier isotopes and depart from the value expected for a near pure neutron h11/2 configuration. Broken-symmetry density functional theory calculations applied to the sequence of 11/2− states reproduce the magnitude and location of this deviation. The g(11/2−) values are affected by shape core polarization; the odd 0h11/2 neutron couples to Jπ=2+,4+,6+... configurations in the weakly-deformed effective core, causing a decrease in the g-factor magnitudes.

Published in Physics Letters B

ISSN: 0370-2693 (Print); 1873-2445 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/physics-letters-b/

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