Enhanced E3 transitions and mixed configurations for core excited isomers in 210At and 211At
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Dracoulis, G. D.
Steed, C. A.
Byrne, A. P.
Poletti, S. J.
Stuchbery, A. E.
Bark, R. A.
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Abstract
The lifetime and branching ratio of the 19+ isomer in 210At have been measured. Its enhanced E3 decay and g-factor, and those of the related 39 2- isomer in 211At are compared with the results of a semi-empirical shell model calculation which includes couplings to the 3- octupole vibration, resulting in mixed configurations. Lifetimes were also obtained for the 15- isomer in 210At, and the 29 2+ isomer in 209At.
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Nuclear Physics, Section A
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