Cu charge radii reveal a weak sub-shell effect at $N=40$

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Cu charge radii reveal a weak sub-shell effect at $N = 40$

M. L. Bissell, T. Carette, K. T. Flanagan, P. Vingerhoets, J. Billowes, K. Blaum, B. Cheal, S. Fritzsche, M. Godefroid, M. Kowalska, J. Krämer, R. Neugart, G. Neyens, W. Nörtershäuser, and D. T. Yordanov

Phys. Rev. C 93, 064318 – Published 17 June 2016

Abstract

Collinear laser spectroscopy on ${}^{58 - 75}{Cu}$ isotopes was performed at the CERN-ISOLDE radioactive ion beam facility. In this paper we report on the isotope shifts obtained from these measurements. State-of-the-art atomic physics calculations have been undertaken in order to determine the changes in mean-square charge radii $δ {〈 r^{2} 〉}^{A, A^{'}}$ from the observed isotope shifts. A local minimum is observed in these radii differences at $N = 40$ , providing evidence for a weak $N = 40$ sub-shell effect. However, comparison of $δ {〈 r^{2} 〉}^{A, A^{'}}$ with a droplet model prediction including static deformation deduced from the spectroscopic quadrupole moments, points to the persistence of correlations at $N = 40$ .

Received 24 February 2016

DOI:https://doi.org/10.1103/PhysRevC.93.064318

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Published by the American Physical Society

Physics Subject Headings (PhySH)

Nuclear charge distribution Shell model

59 ≤ A ≤ 89

Nuclear Physics

Authors & Affiliations

M. L. Bissell^1,2, T. Carette³, K. T. Flanagan^1,4,2, P. Vingerhoets¹, J. Billowes², K. Blaum⁵, B. Cheal^2,6, S. Fritzsche^7,8, M. Godefroid³, M. Kowalska⁹, J. Krämer^10,11, R. Neugart^5,10, G. Neyens¹, W. Nörtershäuser^10,11, and D. T. Yordanov^5,9,12

¹Instituut voor Kern- en Stralingsfysica, KU Leuven, B 3001 Leuven, Belgium
²School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom
³Chimie quantique et photophysique, Université libre de Bruxelles, B 1050 Brussels, Belgium
⁴I.P.N. Orsay, F-91940 Orsay Cedex, France
⁵Max-Plank-Institut für Kernphysik, D-69117 Heidelberg, Germany
⁶Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
⁷Helmholtz-Institut Jena, D-07743 Jena, Germany
⁸Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, D 07743 Jena, Germany
⁹Physics Department, CERN, CH-1211 Geneva 23, Switzerland
¹⁰Institut für Kernchemie, Universität Mainz, D-55128 Mainz, Germany
¹¹Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany
¹²CSNSM-IN2P3-CNRS, Université de Paris Sud, F-91405 Orsay, France

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Issue

Vol. 93, Iss. 6 — June 2016

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