Abstract
Coulomb excitation of states in up to J=(21/2) has been observed with 160-MeV and 617-MeV ions. Most of these states are grouped into three rotational-like bands based on the ground state, the first excited state, and the γ-vibrational-like state at 686 keV. The average deviation between experimental and theoretical energies for 20 states is 45 keV for the particle-asymmetric-rigid-rotor model and 125 keV for the interacting boson fermion approximation model [limited to broken Spin(6) symmetry, and only the orbital is considered]. The overall agreement of both model predictions with experimental γ-ray yields for transitions within the band is quite good. For interband transitions originating in the K and bands, the interacting boson fermion approximation model tends to underestimate the γ-ray yields by one to two orders of magnitude. These six moderately collective transitions correspond to Δ=2 transitions in the U(6/4) and U(6/20) supersymmetry schemes and are strictly forbidden in these schemes. For both supersymmetric schemes there is a lack of detailed agreement with the very collective E2 transitions which have Δ=0,±1. The triaxial rotor model description of the experimental energies and the collective E2 transitions is the most successful approach. The B(E3) for excitation of several negative-parity states in is (4±1)B(E.
- Received 29 July 1985
DOI:https://doi.org/10.1103/PhysRevC.33.855
©1986 American Physical Society