The measurement of the Kr(n,p)Br reaction cross-section for the d-T neutrons using highly enriched gas target.

The cross sections of the Kr(n,p)Br reaction were measured through the secondary decay of the residual nucleus Br at the neutron energies of 13.59, 13.86, 14.13, 14.70, and 14.94 MeV. The characteristic gamma-ray of 616.3 keV energy emitted by Br was selected to determine the activity of the residual nucleus Br. The spherical target sample is a highly enriched, pure, and high-pressure Kr isotope gas. The self-absorption of a 616.3 keV energy gamma ray, the geometry of the spherical sample, and the solid angle of the sample were corrected. The K-400 neutron generator of the China Academy of Engineering Physics (CAEP) was used for this experiment. The reaction T(d,n)He provides quasi-monoenergetic neutrons. The neutron fluence was monitored using the monitor reaction Al(n,α)Na, which has a threshold energy similar to Kr(n,p)Br reaction. The activity of the irradiated Kr samples was determined using a high-purity germanium detector with high resolution and an off-line gamma spectrum technique. The covariance analysis was performed to determine the total uncertainty of the cross-section and the correlation matrix. The measured cross sections of Kr(n,p)Br reaction were compared with the previously reported experimental results, the theoretical results of the TALYS-1.96 simulation, and the evaluation results. In this experiment, the Kr(n,p)Br reaction cross section obtained over a wide energy range is extremely useful for testing the nuclear theoretical model and strengthening the nuclear database.