Alpha-particle-emission probabilities in the decay of 234U and photon-emission probabilities in the decays of 234U, 239Np and 243Am

Alpha-particle-emission probabilities in the decay of 234U and photon-emission probabilities in the decays of 234U, 239Np and 243Am have been measured. The α-particle-emission probabilities were measured using an ion-implanted silicon detector. The results were obtained from measurments in various solid angles and extrapolations to solid angle zero. The photon-emission probabilities were deduced from the photon-emission rates, measured with a calibrated high-purity-Ge detector, and the disintegration rates, determined by α-particle counting in well-defined solid angles. The present results improve appreciably the accuracy of the pertinent decay data. (author)