Abstract
Excited states of , populated in the reaction , ) at a beam energy of 112.5 MeV, have been studied. Experimental information on two negative-parity bands has been significantly upgraded with the addition of new rays and levels. Small values of the reduced transition probability ) and a general absence of a measurable Doppler shift in the transitions suggest that the states are weakly deformed. Several positive-parity levels have been grouped into two bands based on their observed properties. Spin parities have been proposed for a majority of the states belonging to the different bands. Lifetimes have been measured for the eight states belonging to the two positive-parity bands from Doppler shift attenuation data, including an upper limit for the highest energy state. The behavior of the deduced ) and ) values as a function of level spin supports the interpretation of one of these bands within the framework of the shears mechanism. A study of these reduced transition probabilities in the light of the semiclassical model of the shears mechanism, proposed by Macchiavelli and co-workers, confirms this interpretation. The effective gyromagnetic ratio and the interaction strength between the two blades of the shears have been estimated from this study.
3 More- Received 18 April 2018
DOI:https://doi.org/10.1103/PhysRevC.98.034320
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