Search for mixed-symmetry states of nuclei in the vicinity of the double-magic nucleus 208Pb
1 Faculty of Physics, St. Kliment Ohridski University of Sofi, 1164 Sofia, Bulgaria
2 Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
3 Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
4 Bulgarian Academy of Sciences, Institute for Nuclear Research and Nuclear Energy, 1784 Sofi, Bulgaria
5 Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
6 Grand Accélérateur National d’Ions Lourds, CEA/DSM-CNRS/IN2P3, BP 55027, F-14076, Caen Cedex 5, France
b Present address: University of the West of Scotland, PA1 2BE Paisley, United Kingdom and Scottish Univ. Phys. Alliance, Glasgow G12 8QQ, Scotland
Published online: 19 January 2016
In this work we present the results from two experiments dedicated to search for quadrupolecollective isovector valence-shell excitation, the states with so-called mixed proton-neutron symmetry (MSS), in nuclei around the doubly magic nucleus 208Pb. 212Po was studied in an α-transfer reaction. 204Hg was studied in an inverse kinematics Coulomb excitation reaction on a carbon target. Both experiments provide indications for existence of one-phonon MSSs. Those are the first experimentally identified MSSs in the mass A ≈ 208 region.
© Owned by the authors, published by EDP Sciences, 2016
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