For the fission of 'Am induced by fast neutrons from a~Pu critical assembly, we have determined the mass-yield distribution and measured independent fission yields and one isomer ratio. The mass-yield distribution curve was constructed from the results for 29 total chain yields which were derived from measurements of fission products ranging from 'Y to ' 'Tb. Absolute fission yields were obtained with an accuracy of 4% by the requirement of unit total yield in each half of the mass-yield distribution curve and by use of the U(n, f) and U(n, f) monitor reactions. The peak-to-valley ratio is about 60. Several independent fractional chain yields were measured. Values of Z~, the most probable charge for a given mass number, inferred from these measurements are in good agreement with those estimated from independent-yield systematics. NUCLEAR REACTIONS, FISSION 24'Am(n, f), E =degraded fission-spectrum distribution; measured fission yields, deduced fission mass distribution. Measured independent fractional chain yields; measured isomer ratio.
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