Kilo-Electron-Volt Neutron Capture Cross Sections of the Krypton Isotopes

The neutron capture cross sections of the stable krypton isotopes were determined in the energy interval from 4 to 250 keV using a C₆D₆-detector system in conjunction with the time-of-flight technique. The energy resolution of the measurement was 4% at 20 keV and 6% at 100 keV, and the experimental uncertainties were typically 6 to 10%. The measurements were complemented by statistical model calculations of all krypton isotopes in the mass range 78 < A < 86 to also obtain reliable cross sections for the unstable nuclei ^79,81,85Kr. These calculations were based on local systematics for all relevant parameters, and the results were estimated to show uncertainties of 20 to 25%. Maxwellian average cross sections were calculated for kT = 30keV.