Abstract
An in-beam spectroscopic study of was made using a 91 MeV F,4n) reaction. Two positive parity bands were observed based on the proton orbital with (π,α)=(+,±(1/2)). A strongly populated negative parity (-,-(1/2)) band was also seen (based on the proton orbital). The unfavored (-,+(1/2)) structure may also be present. In both the positive and negative parity bands the first backbend is attributed to the alignment of two protons on the basis of cranked shell model calculations. The crossing frequency was found to increase in the (-,-(1/2)) band because of blocking of the orbital. The alignment of protons in causes a shift of γ towards ∼+10° with nearly collective prolate deformation. Also, there is some evidence for a second backbend and an upbend in the case of positive and negative parity bands, respectively. They could result from the alignment of the neutrons.
- Received 11 February 1986
DOI:https://doi.org/10.1103/PhysRevC.34.523
©1986 American Physical Society