New Information on the Occurrence of the O(6) Symmetry in Nuclei

¹ Institut für Kernphysik, Technische Universiät Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt, Germany
² Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
³ Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, MA 01854, USA
⁴ National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973, USA
⁵ Faculty of Physics, St. Kliment Ohridski University of Sofia, 1164 Sofia, Bulgaria

^a e-mail: pietralla@ikp.tu-darmstadt.de

Published online: 28 May 2015

Abstract

New γγ-coincidence relations and E2 decay transition rates in the isotopes ^194,196Pt have been deduced from γ-ray spectroscopy experiments using the Gammasphere spectrometer in projectile-Coulomb excitation reactions of beams of ^194,196Pt ions provided by the ATLAS accelerator facility. The results give access to observables that are crucial for a classification of excited quadrupole-collective states in terms of quantum numbers associated with the analytically solvable O(6) dynamical symmetry of the interacting boson model. The data on ¹⁹⁶Pt corroborate the qualitative pattern of excitation energies and E2 transition rates expected from the O(6) solution but the excitation energies significantly deviate from it on a quantitative level.