Abstract
The half-life of the 279 keV excited state of Tl 203 has been measured from the logarithmic slope of a delayed coincidence curve. This method is preferable to the centroid shift method which was used for previous delayed coincidence measurements, since it is much less sensitive to systematic effects and to drifts in the apparatus. The half-life was found to be T 1 2 = (2.41±0.10) × 10 −10 sec , in agreement with previous results from resonance fluorescence, but in moderate disagreement with most recent Coulomb excitation results.
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