Probing the single-particle behavior above $^{132}\mathrm{Sn}$ via electromagnetic moments of $^{133,134}\mathrm{Sb}$ and $N=82$ isotones

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Probing the single-particle behavior above ${}^{132}{Sn}$ via electromagnetic moments of ${}^{133, 134}{Sb}$ and $N = 82$ isotones

S. Lechner, Z. Y. Xu, M. L. Bissell, K. Blaum, B. Cheal, G. De Gregorio, C. S. Devlin, R. F. Garcia Ruiz, A. Gargano, H. Heylen, P. Imgram, A. Kanellakopoulos, Á. Koszorús, S. Malbrunot-Ettenauer, R. Neugart, G. Neyens, W. Nörtershäuser, P. Plattner, L. V. Rodríguez, X. F. Yang, and D. T. Yordanov

Phys. Rev. C 104, 014302 – Published 2 July 2021

Abstract

Magnetic and quadrupole moments of the $7 / 2^{+}$ ground state in ${}^{133}{Sb}$ and the $(7^{-})$ isomer in ${}^{134}{Sb}$ have been measured by collinear laser spectroscopy to investigate the single-particle behavior above the doubly magic nucleus ${}^{132}{Sn}$ . The comparison of experimental data of the $7 / 2^{+}$ states in ${}^{133}{Sb}$ and neighboring $N = 82$ isotones to shell-model calculations reveals the sensitivity of magnetic moments to the splitting of the spin-orbit partners $π 0 g_{9 / 2}$ and $π 0 g_{7 / 2}$ across the proton shell closure at $Z = 50$ . In contrast, quadrupole moments of the $N = 82$ isotones are insensitive to cross-shell excitations, but require the full proton model space from $Z = 50 to 82$ for their accurate description. In fact, the linear trend of the quadrupole moment follows approximately the expectation of the seniority scheme when filling the $π 0 g_{7 / 2}$ orbital. As far as the isomer in ${}^{134}{Sb}$ is concerned, its electromagnetic moments can be perfectly described by the additivity rule employing the moments of ${}^{133}{Sb}$ and ${}^{133}{Sn}$ , respectively. These findings agree with shell-model calculations and thus confirm the weak coupling between the valence proton and neutron in ${}^{134}{Sb}$ .

Received 28 April 2021
Accepted 26 May 2021

DOI:https://doi.org/10.1103/PhysRevC.104.014302

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Fine & hyperfine structure Laser spectroscopy Nuclear structure & decays

90 ≤ A ≤ 149 Electric moment Magnetic moment

Radioactive beams Shell model

Nuclear PhysicsAtomic, Molecular & Optical

Authors & Affiliations

S. Lechner ^1,2,*, Z. Y. Xu^3,4, M. L. Bissell⁵, K. Blaum⁶, B. Cheal ⁷, G. De Gregorio ^8,9, C. S. Devlin ⁷, R. F. Garcia Ruiz^1,†, A. Gargano ⁸, H. Heylen¹, P. Imgram ¹⁰, A. Kanellakopoulos ^3,‡, Á. Koszorús^3,§, S. Malbrunot-Ettenauer¹, R. Neugart^6,11, G. Neyens ^1,3, W. Nörtershäuser ¹⁰, P. Plattner^1,12, L. V. Rodríguez ^6,13,∥, X. F. Yang¹⁴, and D. T. Yordanov¹³

¹Experimental Physics Department, CERN, CH-1211 Geneva 23, Switzerland
²Technische Universität Wien, AT-1040 Wien, Austria
³Instituut voor Kern- en Stalingsfysica, KU Leuven, B-3001, Leuven, Belgium
⁴Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
⁵School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, England, United Kingdom
⁶Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
⁷Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, England, United Kingdom
⁸Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, 80126 Napoli, Italy
⁹Dipartimento di Matematica e Fisica, Università degli Studi della Campania Luigi Vanvitelli, 81100 Caserta, Italy
¹⁰Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
¹¹Institut für Kernchemie, Universität Mainz, D-55128 Mainz, Germany
¹²Universität Innsbruck, AT-6020 Innsbruck, Austria
¹³Université Paris-Saclay, Centre National de la Recherche Scientifique IN2P3, IJCLab, 91405 Orsay, France
¹⁴School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 10871, China

^*simon.lechner@cern.ch
^†Present address: Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
^‡Present address: HEPIA Geneva, HES-SO, 1202 Geneva, Switzerland.
^§Present address: Oliver Lodge Laboratory, Oxford Street, University of Liverpool, Liverpool L69 7ZE, England, United Kingdom.
^∥Present address: Experimental Physics Department, CERN, CH-1211 Geneva 23, Switzerland.

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Vol. 104, Iss. 1 — July 2021

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Physical Review C

covering nuclear physics

Probing the single-particle behavior above ${}^{132}{Sn}$ via electromagnetic moments of ${}^{133, 134}{Sb}$ and $N = 82$ isotones

Phys. Rev. C 104, 014302 – Published 2 July 2021

Abstract

Physics Subject Headings (PhySH)

Authors & Affiliations

Article Text

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Issue

Physical Review C

covering nuclear physics

Probing the single-particle behavior above Sn132 via electromagnetic moments of Sb133,134 and N=82 isotones

Phys. Rev. C 104, 014302 – Published 2 July 2021

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Probing the single-particle behavior above ${}^{132}{Sn}$ via electromagnetic moments of ${}^{133, 134}{Sb}$ and $N = 82$ isotones