Measurement of the Tm-169(n, 3n)Tm-167 cross section and the associated branching ratios in the decay of Tm-167

摘要

The cross section for the Tm-169(n, 3n) Tm-167 reaction was measured from 17 to 22 MeV using quasimonoenergetic neutrons produced by the H-2(d, n) He-3 reaction. This energy range was studied to resolve the discrepancy between previous (n, 3n) cross-section measurements. In addition, the absolute gamma-ray branching ratios following the electron-capture decay of Tm-167 were measured. These results provide more reliable nuclear data for an important diagnostic that is used at the National Ignition Facility to estimate the yield of reaction-in-flight neutrons produced via the inertial-confinement-fusion plasma in deuterium-tritium capsules.