Cross sections and yields important for fission product absorption in thermal reactors

There are quite large discrepancies when calculated and measured total fission product absorption are compared. These discrepancies are in the 135Xe transient as well as the long term absorption. Since these experiments and discrepancies will be reviewed later at this meeting by England and Wilson, it seems worthwhile to look closely at the data of the few fission products that have reactivity effects large enough that uncertainties in their yields or cross sections might possibly account for a significant part of the discrepancies. Only 135Xe, 149Sm, 143Nd and 147Pm satisfy this requirement