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

Gray TJ, Stuchbery AE, Dobaczewski J, Blazhev A, Alshammari HA, Bignell LJ, Bonnard J, Coombes BJ, Dowie JT, Gerathy MS, Kibédi T, Lane GJ, McCormick BP, Mitchell AJ, Nicholls C, Pope JG, Reinhard PG, Spinks NJ, Zhong Y (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Physics Letters B Elsevier

Book Volume: 847

Article Number: 138268

DOI: 10.1016/j.physletb.2023.138268

Abstract

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 J^π=2⁺,4⁺,6⁺.. configurations in the weakly-deformed effective core, causing a decrease in the g-factor magnitudes.

Authors with CRIS profile

Paul-Gerhard Reinhard Naturwissenschaftliche Fakultät

Involved external institutions

Australian National University (ANU)

Australia (AU) University of York

United Kingdom (GB) Universität zu Köln

Germany (DE)

How to cite

APA:

Gray, T.J., Stuchbery, A.E., Dobaczewski, J., Blazhev, A., Alshammari, H.A., Bignell, L.J.,... Zhong, Y. (2023). Shape polarization in the tin isotopes near N = 60 from precision g-factor measurements on short-lived 11/2− isomers. Physics Letters B, 847. https://dx.doi.org/10.1016/j.physletb.2023.138268

MLA:

Gray, T. J., et al. "Shape polarization in the tin isotopes near N = 60 from precision g-factor measurements on short-lived 11/2− isomers." Physics Letters B 847 (2023).