Abstract
Delayed-neutron activity of separated isotopes of krypton and xenon and their decay products has been studied. The TRISTAN on-line isotope separator system at the Ames Laboratory Research Reactor was used to provide sources of short-lived gaseous fission products of selected masses, through for krypton and for xenon. Total delayed-neutron yields for each mass were measured by a calibrated long counter, and the relative yields of the parent and daughter nuclei in an isobaric decay chain were determined by multiscaling the delayed-neutron activity and resolving the contributions for different half-lives. The precusors and delayed neutron emission probabilities determined in this study are , 0.040%; , 0.012%; , 2.60%; , 1.65%; , 0.054%; , 0.073%; , 0.45%; and , 0.27%. A comparison is made between predictions for delayed-neutron emission from several semiempirical mass formulas and observations for isotopes of As, Br, Kr, Rb, Sb, I, Xe, and Cs.
- Received 27 June 1968
DOI:https://doi.org/10.1103/PhysRev.177.1805
©1969 American Physical Society