Dipole and quadrupole moments of $^{73\text{--}78}\mathrm{Cu}$ as a test of the robustness of the $Z=28$ shell closure near $^{78}\mathrm{Ni}$

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Dipole and quadrupole moments of ${}^{73 – 78}{Cu}$ as a test of the robustness of the $Z = 28$ shell closure near ${}^{78}{Ni}$

R. P. de Groote, J. Billowes, C. L. Binnersley, M. L. Bissell, T. E. Cocolios, T. Day Goodacre, G. J. Farooq-Smith, D. V. Fedorov, K. T. Flanagan, S. Franchoo, R. F. Garcia Ruiz, Á. Koszorús, K. M. Lynch, G. Neyens, F. Nowacki, T. Otsuka, S. Rothe, H. H. Stroke, Y. Tsunoda, A. R. Vernon, K. D. A. Wendt, S. G. Wilkins, Z. Y. Xu, and X. F. Yang

Phys. Rev. C 96, 041302(R) – Published 4 October 2017

Abstract

Nuclear spins and precise values of the magnetic dipole and electric quadrupole moments of the ground states of neutron-rich ${}^{73 – 78}{Cu}$ isotopes were measured using the Collinear Resonance Ionization Spectroscopy (CRIS) experiment at the CERN On-Line Isotope Mass Separator (ISOLDE) facility. The nuclear moments of the less exotic ${}^{73, 75}{Cu}$ isotopes were remeasured with similar precision, yielding values that are consistent with earlier measurements. The moments of the odd-odd isotopes, and $_{29}^{78} Cu$ ( $N = 49$ ) in particular, are used to investigate excitations of the assumed doubly magic ${}^{78}{Ni}$ core through comparisons with large-scale shell-model calculations. Despite the narrowing of the $Z = 28$ shell gap between $N \sim 45$ and $N = 50$ , the magicity of $Z = 28$ and $N = 50$ is restored toward ${}^{78}{Ni}$ . This is due to weakened dynamical correlations, as clearly probed by the present moment measurements.

Received 27 May 2017
Revised 3 August 2017

DOI:https://doi.org/10.1103/PhysRevC.96.041302

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)

Nuclear structure & decays Spectroscopic factors & electromagnetic moments

Laser spectroscopy

59 ≤ A ≤ 89

Nuclear Physics

Authors & Affiliations

R. P. de Groote^1,*, J. Billowes², C. L. Binnersley², M. L. Bissell², T. E. Cocolios¹, T. Day Goodacre³, G. J. Farooq-Smith¹, D. V. Fedorov⁴, K. T. Flanagan², S. Franchoo⁵, R. F. Garcia Ruiz², Á. Koszorús¹, K. M. Lynch⁶, G. Neyens^1,6, F. Nowacki⁷, T. Otsuka^1,8,9,10, S. Rothe^2,3, H. H. Stroke¹¹, Y. Tsunoda¹⁰, A. R. Vernon², K. D. A. Wendt¹², S. G. Wilkins², Z. Y. Xu¹, and X. F. Yang¹

¹KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
²School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom
³Engineering Department, CERN, CH-1211 Geneva 23, Switzerland
⁴Petersburg Nuclear Physics Institute, 188350 Gatchina, Russia
⁵Institut de Physique Nucléaire d'Orsay, F-91406 Orsay, France
⁶Physics Department, CERN, CH-1211 Geneva 23, Switzerland
⁷Institute Pluridisciplinaire Hubert Curien, 23 rue du Loess, F-67037 Strasbourg Cedex 2, France
⁸Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
⁹RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
¹⁰Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
¹¹Department of Physics, New York University, New York, New York 10003, USA
¹²Institut für Physik, Johannes Gutenberg-Universität, D-55128 Mainz, Germany

^*ruben.degroote@kuleuven.be

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Vol. 96, Iss. 4 — October 2017

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Physical Review C

covering nuclear physics

Dipole and quadrupole moments of ${}^{73 – 78}{Cu}$ as a test of the robustness of the $Z = 28$ shell closure near ${}^{78}{Ni}$

Phys. Rev. C 96, 041302(R) – Published 4 October 2017

Abstract

Physics Subject Headings (PhySH)

Authors & Affiliations

Article Text

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Issue

Physical Review C

covering nuclear physics

Dipole and quadrupole moments of Cu73–78 as a test of the robustness of the Z=28 shell closure near Ni78

Phys. Rev. C 96, 041302(R) – Published 4 October 2017

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Dipole and quadrupole moments of ${}^{73 – 78}{Cu}$ as a test of the robustness of the $Z = 28$ shell closure near ${}^{78}{Ni}$