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

doi:10.1016/j.physletb.2023.138268

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

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

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

Original language	Undefined/Unknown
Article number	138268
Number of pages	6
Journal	Physics Letters B
Volume	847
Early online date	25 Oct 2023
DOIs	https://doi.org/10.1016/j.physletb.2023.138268
Publication status	Published - 10 Dec 2023

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10.1016/j.physletb.2023.138268Licence: CC BY

Shape polarization in the tin isotopes near 𝑁 = 60 from precision 𝑔-factor measurements on short-lived 11∕2− isomers
© 2023 Oak Ridge National Laboratory
Final published version, 712 KBLicence: CC BY

Nuclear Physics Consolidated Grant 2021-2024
Jenkins, D., Andreyev, A., Bashkanov, M., Bentley, M., Dobaczewski, J. J., Laird, A. M., Paschalis, S., Pastore, A., Petri, M., Wadsworth, R., Watts, D. & Zachariou, N.
SCIENCE AND TECHNOLOGY FACILITIES COUNCIL (STFC)
1/10/21 → 31/03/25
Project: Research project (funded) › Research

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Gray, T. J., Stuchbery, A. E., Dobaczewski, J., Blazhev, A., Alshammari, H. A., Bignell, L. J., Bonnard, J., Coombes, B. J., Dowie, J. T. H., Gerathy, M. S. M., Kibédi, T., Lane, G. J., McCormick, B. P., Mitchell, A. J., Nicholls, C., Pope, J. G., Reinhard, P.-G., Spinks, N. 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, Article 138268. https://doi.org/10.1016/j.physletb.2023.138268

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

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

author = "T.J. Gray and A.E. Stuchbery and J. Dobaczewski and A. Blazhev and H.A. Alshammari and L.J. Bignell and J. Bonnard and B.J. Coombes and J.T.H. Dowie and M.S.M. Gerathy and T. Kib{\'e}di and G.J. Lane and B.P. McCormick and A.J. Mitchell and C. Nicholls and J.G. Pope and P.-G. Reinhard and N.J. Spinks and Y. Zhong",

note = "{\textcopyright} 2023 Oak Ridge National Laboratory.",

year = "2023",

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day = "10",

doi = "10.1016/j.physletb.2023.138268",

language = "Undefined/Unknown",

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journal = "Physics Letters B",

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Gray, TJ, Stuchbery, AE, Dobaczewski, J, Blazhev, A, Alshammari, HA, Bignell, LJ, Bonnard, J, Coombes, BJ, Dowie, JTH, Gerathy, MSM, Kibédi, T, Lane, GJ, McCormick, BP, Mitchell, AJ, Nicholls, C, Pope, JG, Reinhard, P-G, Spinks, NJ & 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, vol. 847, 138268. https://doi.org/10.1016/j.physletb.2023.138268

TY - JOUR

T1 - Shape polarization in the tin isotopes near N = 60 from precision g-factor measurements on short-lived 11/2− isomers

AU - Gray, T.J.

AU - Stuchbery, A.E.

AU - Dobaczewski, J.

AU - Blazhev, A.

AU - Alshammari, H.A.

AU - Bignell, L.J.

AU - Bonnard, J.

AU - Coombes, B.J.

AU - Dowie, J.T.H.

AU - Gerathy, M.S.M.

AU - Kibédi, T.

AU - Lane, G.J.

AU - McCormick, B.P.

AU - Mitchell, A.J.

AU - Nicholls, C.

AU - Pope, J.G.

AU - Reinhard, P.-G.

AU - Spinks, N.J.

AU - Zhong, Y.

PY - 2023/12/10

Y1 - 2023/12/10

N2 - 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.

AB - 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.

U2 - 10.1016/j.physletb.2023.138268

DO - 10.1016/j.physletb.2023.138268

M3 - Letter

SN - 0370-2693

VL - 847

JO - Physics Letters B

JF - Physics Letters B

M1 - 138268

ER -

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

Abstract

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Nuclear Physics Consolidated Grant 2021-2024

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