Abstract
The nucleus is investigated using -coincidence studies following the decay of the ground state of The data survey short-lived states, mixing ratios, and, together with the previously known lifetimes, also absolute transition strengths The proton-neutron mixed-symmetry states (isovector quadrupole excitation) and (“scissors mode”) were identified from their decay patterns and absolute transition strengths. A transition between these mixed-symmetry states was observed and its rate is discussed. We additionally present a candidate for the two-phonon state, whose structure is closely related to the excitation. Fifteen and strengths involving mixed-symmetry states show a reasonable agreement with the prediction of the pure O(6) limit of the proton-neutron extension of the interacting boson model (IBM-2) using the effective quadrupole boson charges and the g-factor difference as the only free parameters.
- Received 21 December 2001
DOI:https://doi.org/10.1103/PhysRevC.65.054311
©2002 American Physical Society