Abstract
The halflife of the 6.25 keV first excited state of Ta181 has been determined by a delayed coincidence experiment with a time-to-pulse height conversion method and found to be t½ = (6.8±0.4) × 10−6s. The E1 gamma transition probability of the state is smaller by a factor of 5×105 than the single particle estimate in qualitative accord with Nilsson's asymptotic selection rules. The normalized transition probability agrees within a factor of five with four other E1 transitions occurring between levels of neighbouring nuclei which are predicted to be almost identical according to the unified theory.
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