Abstract
Excited states have been populated in and in complementary backed- and thin-target experiments using the Stony Brook and the -detector arrays. The level schemes for both isotopes have been extended and modified, including the first observation of bands in Lifetimes of states in four bands and one band have been measured using the Doppler-shift attenuation method. Experimental total angular momenta and reduced transition strengths for the bands have been compared with tilted axis cranking predictions for shears bands with configurations involving one proton hole and one or three valence quasineutrons from the and orbitals. The bands have been compared with principal axis cranking predictions for configurations with two proton holes and a or proton and one- or three-quasineutron configurations involving the and orbitals. In general, there is good overall agreement for both the angular momenta and reduced transition strengths. The and bands have large ratios as expected for the shears mechanism. The strengths deduced for the bands show a decreasing trend as a function of spin, which is also a feature of the shears mechanism. Configuration assignments have been made for most observed bands based on comparisons with theory and systematics of neighboring nuclei.
- Received 22 March 2001
DOI:https://doi.org/10.1103/PhysRevC.64.054314
©2001 American Physical Society