Abstract
High-spin data are presented for 170Ta and 171Ta for the first time, and the known level scheme of 173Ta is extended to higher spins. Anomalies found in the crossing frequencies for the alignment of a pair of neutrons are considered. At high spin a large and constant value of J (2), with J (2) > J (1), is found for two 171Ta bands and the implications of this are discussed. The πi 13/2 [660]1/2 +, α = + 1/2 orbital is identified as it crosses the rotational band built on the [402]5/2 +, α = + 1/2 orbital in 171Ta. Magnetic transition probabilities obtained from measured branching ratios show the effects of the aligning pair of neutrons and the spectator orbital. The data are interpreted using cranked shell-model calculations and a semiclassical vector-coupling scheme developed by Donau and Frauendorf.
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