The ^68mCu/⁶⁸Cu isotope as a new probe for hyperfine studies: The nuclear moments

¹ Department of Physics and CICECO, University of Aveiro - 3810-193 Aveiro, Portugal
² KU Leuven, Instituut voor Kern-en Stralingsfysica - Celestijnenlaan 200 D, 3001 Leuven, Belgium
³ CERN, 1211 Geneva 23, Switzerland
⁴ Department of Chemistry, Faculty of Science, University of Copenhagen - Universitetsparken 5, 2100 Copenhagen, Denmark
⁵ Department of Medicine, Democritus University of Thrace, Alexandroupoli Campus 6 km Alexandroupolis-Makris, 68100 Alexandroupoli, Greece
⁶ Centro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico, Universidade de Lisboa 2686-953 Sacavém, Portugal
⁷ TRIUMF - 4004 Wesbrook Mall Vancouver, BC V6T 2A3, Canada
⁸ Department of Physics, K.N.Toosi University of Technology - P.O.Box 15875-4416, Tehran, Iran
⁹ Institute of Physical Chemistry, RWTH-Aachen - Aachen, Germany
¹⁰ GSI Helmholtzzentrum für Schwerionenforschung GmbH - D-64291 Darmstadt, Germany
¹¹ National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University - East Lansing, MI 48824-1321, USA
¹² Institut Laue-Langevin - 71 avenue des Martyrs, F-38042 Grenoble, France
¹³ Laboratory of Powder Technology, École Polytechnique Fédérale de Lausanne (EPFL) - CH-1015, Switzerland
¹⁴ School of Physics and Astronomy, The University of Manchester - Manchester, M13 9PL, UK

Received: 24 June 2016
Accepted: 6 October 2016

Abstract

Time Differential Perturbed Angular Correlation of γ-rays (TDPAC) experiments were performed for the first time in the decay of ^68mCu produced at the ISOLDE facility at CERN. Due to the short half-life of the source isotope, the measurements were carried out online. The intermediate state offers the unique opportunity to study the electromagnetic fields acting at a copper probe in condensed matter via hyperfine interactions. The present work allowed determination of the nuclear moments for this state. The electric quadrupole moment was obtained from an experiment performed in Cu₂O and the magnetic dipole moment from measurements in cobalt and nickel foils. The results are discussed in the framework of shell model calculations and the additivity rule for nuclear moments with respect to the robustness of the N = 40 sub-shell.