Measurement and systematic analysis of the cross sections of the 82 Kr( n , p ) 82 Br reaction induced by d-T neutrons*

Abstract The cross section of the 82 Kr( n , p ) 82 Br reaction induced by d-T neutrons was measured using the activation method. Incident neutrons are generated through the 3 H( d , n ) 4 He reaction. High-purity natural krypton gas held at high pressure was used as the target sample. The neutron energy and its uncertainty were determined based on the Q -value equation of the 3 H( d , n ) 4 He reaction and the experimental conditions. The neutron fluence incident on the sample is monitored by the 27 Al( n , α ) 24 Na reaction. The eight characteristic gamma rays of the 82 Br daughter nucleus were selected to determine its activity by off-line gamma spectrometry using an HPGe detector. The 82 Kr( n , p ) 82 Br reaction cross sections with lower uncertainties were finally determined at five neutron energies by the weighted method. The measured cross sections were compared with previous experimental studies, theoretical values from Talys-2.0, calculation results from the systematics (empirical and semi-empirical) formulas, and evaluation results. The present high-precision cross sections for the 82 Kr( n , p ) 82 Br reaction over a wide energy range not only help to validate and evaluate nuclear reaction models, but also substantially enrich the neutron-induced nuclear reaction cross sections database.