1259 the yield of Er iw is high by a factor of 6 from that obtained from the Gaussian curve. We feel that most of this discrepancy is due to a combination of Er, Tm, and Yb target impurities. Part of it could also be due to radioactive impurities in the low-counting Er samples.These two sources of error operate in opposite directions, one tending to lower an observed yield, the other tending to raise it. An error in one measurement changes the Gaussian curve that we have fitted, using that value, thus obscuring errors in other measurements. Fortunately, the two sources of error are probably not important for any one product. The combined effect is then a general increase in scatter from the smooth Gaussian curve. As noted before, the average deviation from the curve is about 15%, which is not much greater than the average accuracy of the individual results.
SUMMARYWe have measured the fission yields of a number of products formed in low yield from 14.8-MeV neutron fission of Th 232 , U 235 , and U 238 . The results show that, within experimental uncertainty, the wings of the mass-
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.