Abstract
Results from precise measurements of the K conversion coefficients for the 300, 312 and 340 keV γ-rays from 233Pa β − decay reveal nuclear penetration effects for these predominantly M1 transitions. The experimental conversion coefficients, which are about 18% smaller than values from theory neglecting those effects, remove a previous inconsistency in the transition-intensity balance for the decay scheme of 233Pa and allow a total (6±2)% β − branch to the ground and first-excited states. The measured value of (8.8 ±1.4%) for this intensity and the total K X-ray intensity deduced from the present K conversion coefficients, both confirm the revised decay scheme.
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