Transition Probabilities of the 35.5, 428, and 463 keV Transitions in 125Te

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Abstract
The lifetimes of the 35.5 and 463 keV states in 125Te, populated in the beta decay of 125Sb, are determined employing a time-to-pulse-height-converter arrangement. The half-life of the 35.5 keV state, determined by the slope method, yielded a value 1.51 ± 0.05 ns. The mean life of the 463 keV state, determined by the centroid-shift technique, yielded a value (3.8 ± 1.1) × 10−11 s. This value is in complete disagreement with the previous delayed-coincidence results and is in agreement with the recent Coulomb-excitation experiments. The present experimental values are employed to estimate the M1 and E2 transition probabilities of the 35.5, 428, and 463 keV transitions, and are compared with the values obtained from the single-particle estimates. De-Shalit's core-excitation model is found to be not applicable for the present case. The theoretical values estimated using the wave functions of Kisslinger and Sorensen are found to be unsuitable for the estimation of the transition probabilities. The experimental values are therefore employed to obtain phenomenological wave functions for the ground, 35.5 keV, and 463 keV states. The resultant wave functions show sizable parts of the 5/2+ phonon contribution in both the ground and 35.5 (3/2+) keV states, while the 463 keV state contains a dominant 3/2+ phonon contribution.

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