https://doi.org/10.1051/epjconf/20159301038
Do nuclei go pear-shaped? Coulomb excitation of 220Rn and 224Ra at REX-ISOLDE (CERN)
1 School of Engineering, University of the West of Scotland, Paisley, PA1 2BE, UK
2 SUPA, Scottish Universities Physics Alliance, Glasgow G12 8QQ, UK
3 Oliver Lodge Laboratory, Liverpool University, Liverpool L69 7ZE, UK
4 Instituut voor Kern- en Stralingsfysica KU Leuven, Leuven B-3001, Belgium
5 Dept. of Physics & Astronomy, University of Rochester, Rochester, NY 14627-0171, USA
6 ISOLDE, CERN, Geneva CH-1211, Switzerland
7 Institut für Kernphysik, Universität zu Köln, Köln D-50937, Germany
8 GANIL, Caen, BP 55027, F-14076, France
9 Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt D-64289, Germany
10 Department of Nuclear Physics, Lund University, Lund PO Box 118, 221 00, Sweden
11 Department of Physics, University of Michigan, Ann Arbor, Michigan 48104, USA
12 School of Physics & Astronomy, University of Edinburgh, Edinburgh, EH9 3JZ, UK
13 Department of Physics, University of Jyväskylä, Jyväskylä FI-40014, Finland
14 Helsinki Institute of Physics, PO Box 64, FI-00014 Helsinki Finland
15 Department of Physics, University of York, York YO10 5DD, UK
16 Heavy Ion Laboratory, University of Warsaw, Warsaw 02-093, Poland
17 Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94551, USA
18 Maier-Leibnitz-Laboratorium, Ludwig-Maximilians-Universität, Garching D-85748, Germany
19 Physik Department E12, Technische Universität Muenchen, Garching D-85748, Germany
20 Departamento de Fisica Teorica, Universidad Autonoma de Madrid, Madrid 28049, Spain
21 DSM/IRFU/SPhN, CEA Saclay, Gif-sur-Yvette F-91191, France
a Corresponding author: marcus.scheck@uws.ac.uk
Published online: 28 May 2015
The IS475 collaboration conducted Coulomb-excitation experiments with post-accelerated radioactive 220Rn and 224Ra beams at the REX-ISOLDE facility. The beam particles (Ebeam: 2.83 MeV/u) were Coulomb excited using 60Ni, 114Cd, and 120Sn scattering targets. De-excitation γ-rays were detected employing the Miniball array and scattered particles were detected in a silicon detector. Exploiting the Coulomb-excitation code GOSIA for each nucleus several matrix elements could be obtained from the measured γ-ray yields. The extracted ‹3−||E3||0+› matrix element allows for the conclusion that, while 220Rn represents an octupole vibrational system, 224Ra has already substantial octupole correlations in its ground state. This finding has implications for the search of CP-violating Schiff moments in the atomic systems of the adjacent odd-mass nuclei.
© Owned by the authors, published by EDP Sciences, 2015
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
