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HALF LIVES OF FIRST EXCITED STATES OF EVEN NUCLEI OF Em, Ra, Th, U, AND Pu
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1960
Year
E2 Conversion CoefficientsExcited State PropertyAnd PuLocalized Excited StateNuclear PhysicsPhysicsHigh-energy Nuclear ReactionNatural SciencesDouble Beta DecayExcited StatesAtomic PhysicsHalf LivesQuantum ChemistryElectronic Excited StateNuclear DecayBiophysics
The half lives of the first excited states of eighteen even nuclei of Rh, Ra, Th, U, and Pu are measured, and an upper limit is set for a nineteenth. The measurements are made by the delayed coincidence method, using a fast time- toamplitude converter. The experimental half lives all lie between 1.5 and 7.6 x 10/sup -//sup 1//sup 0/ sec. The results are used to calculate reduced transition probabilities, quadrupole moments, and deformation parameters for the nuclei concerned. Comparisons are made between these values and theoretical calculations. Agreement witain 1O% or less is found. Upper limits are set for the half lives of two excited states in Th/sup 2//sup 3//sup / 0 and U/sup 2//sup 3//sup 3/, and calculated E2 conversion coefficients are verified within about 15% for this region of Z and energy. (auth)