Abstract
Constrained Hartree-Fock-Bogoliubov calculations based on Gogny’s force have been performed to determine the potential energy surfaces, collective masses, and moments of inertia used to build a five-dimension collective Hamiltonian treating quadrupole motion in the isotopes. Many collective states have been predicted at low excitation energy, some of them forming γ-vibrational bands. To expand experimental information on γ bands, high statistics measurements on the and electron capture decay of m and m have been performed at the ISOCELE facility. For the first time, γ bands have been identified in and . These new results together with previous experimental information available on the ground state and K=0 excited bands in form a database which has been analyzed and discussed in the present theoretical framework. It is argued that the first K=0 excited band in is a β-vibrational band, and that is a nucleus in which shape coexistence occurs not only for the K=0 bands but also for the γ bands.
- Received 27 May 1994
DOI:https://doi.org/10.1103/PhysRevC.50.2332
©1994 American Physical Society