Cross section measurement for the 14N(n,α0,1)11B reactions in the 4.5-11.5 MeV neutron energy region

AbstraktAbstract

With more accurate measurement method for gas samples, cross sections of the N-14(n,alpha(0,1))B-11 reactions were measured at 24 energy points in the 4.5-11.5 MeV neutron energy region based on the 4.5 MV Van de Graaff accelerator at Peking University and the HI-13 tandem accelerator of China Institute of Atomic Energy (CIAE). The average neutron fluence (phi) through the gas sample was obtained through the combination of a highly enriched (238)U(3)O(8 )sample and the simulation based on SuperMC. The cross sections of the N-14(n,alpha 0)B-11 reaction measured using the gas sample and the solid samples are in agreement with each other. R-matrix analysis was carried out for the n + 14N system using code RAC in the neutron energy region below 30 MeV. A possible valley structure in both the excitation functions of the N-14(n,alpha(0,1))B-11 reactions in the 10-11 MeV neutron energy region was found for the first time.

With more accurate measurement method for gas samples, cross sections of the N-14(n,alpha(0,1))B-11 reactions were measured at 24 energy points in the 4.5-11.5 MeV neutron energy region based on the 4.5 MV Van de Graaff accelerator at Peking University and the HI-13 tandem accelerator of China Institute of Atomic Energy (CIAE). The average neutron fluence (phi) through the gas sample was obtained through the combination of a highly enriched (238)U(3)O(8 )sample and the simulation based on SuperMC. The cross sections of the N-14(n,alpha 0)B-11 reaction measured using the gas sample and the solid samples are in agreement with each other. R-matrix analysis was carried out for the n + 14N system using code RAC in the neutron energy region below 30 MeV. A possible valley structure in both the excitation functions of the N-14(n,alpha(0,1))B-11 reactions in the 10-11 MeV neutron energy region was found for the first time.