CROSS SECTION MEASUREMENTS FOR SOME ELEMENTS SUITED AS THERMAL SPECTRUM INDICATORS:Cd, Sm, Gd AND Lu

摘要

For natural Lu, the energy dependence of the cross section is not well known. Certain assumptions about the cross section function led to unreasonably high values for the 2200 m/s cross section.nComplementary differential measurements of the cross sections of Cd, Sm and Gd were made with the Rl fast chopper. For Cd and Sm the 2200 m/s cross section thus obtained agreed within experimental error with those obtained from the integral measurements. For Gd, the chopper measured value was higher, confirming earlier findings and indicating that the Westcott g factor for Gd is too high.