The cross sections at 5 energy points of the 58Ni(n,α)55Fe reaction were measured in the 4.50 MeV≤En≤5.50 MeV region while those for the 60Ni(n,α)57Fe and 61Ni(n,α)58Fe reactions were measured at En=5.00 and 5.50...The cross sections at 5 energy points of the 58Ni(n,α)55Fe reaction were measured in the 4.50 MeV≤En≤5.50 MeV region while those for the 60Ni(n,α)57Fe and 61Ni(n,α)58Fe reactions were measured at En=5.00 and 5.50 MeV using the 4.5 MV Van de Graaff accelerator at Peking University.A gridded twin ionization chamber(GIC)was used as the detector,and enriched 58Ni,60Ni,and 61Ni foil samples were prepared and mounted at the sample changer of the GIC.Three highly enriched 238U3O8 samples inside the GIC were used to determine the relative and absolute neutron fluxes.The neutron energy spectra were obtained through unfolding the pulse height spectra measured by the EJ-309 liquid scintillator.The interference from the low-energy neutrons and impurities in the samples has been corrected.The present data of the 60Ni(n,α)57Fe reaction are the first measurement results below 6.0 MeV,and those of the 61Ni(n,α)58Fe reactions are the first measurement results in the MeV region.The present results have been compared with existing measurements,evaluations,and TALYS-1.9 calculations.展开更多
Cross sections of the^(58,60,61)Ni(n,α)^(55,57,58)Fe reactions were measured at 8.50,9.50 and 10.50 MeV neutron energies based on the HI-13 tandem accelerator of China Institute of Atomic Energy(CIAE)with enriched^(5...Cross sections of the^(58,60,61)Ni(n,α)^(55,57,58)Fe reactions were measured at 8.50,9.50 and 10.50 MeV neutron energies based on the HI-13 tandem accelerator of China Institute of Atomic Energy(CIAE)with enriched^(58)Ni,^(60)Ni,and^(61)Ni foil samples with backings.A twin gridded ionization chamber(GIC)was used as the charged particle detector,and an EJ-309 liquid scintillator was used to obtain the neutron energy spectra.The relative and absolute neutron fluxes were determined via three highly enriched^(238)U_(3)O_(8)samples inside the GIC.The uncertainty of the present data of the^(58)Ni(n,α)^(55)Fe reaction is smaller than most existing measurements.The present data of^(60)Ni(n,α)^(57)Fe and^(61)Ni(n,α)^(58)Fe reactions are the first measurement results above 8 MeV.The present experimental data could be reasonably reproduced by calculations with TALYS-1.9 by adjusting several default values of theoretical model parameters.展开更多
基金Supported by the National Natural Science Foundation of China(11775006)China Nuclear Data Center and the Science and Technology on Nuclear Data Laboratory。
文摘The cross sections at 5 energy points of the 58Ni(n,α)55Fe reaction were measured in the 4.50 MeV≤En≤5.50 MeV region while those for the 60Ni(n,α)57Fe and 61Ni(n,α)58Fe reactions were measured at En=5.00 and 5.50 MeV using the 4.5 MV Van de Graaff accelerator at Peking University.A gridded twin ionization chamber(GIC)was used as the detector,and enriched 58Ni,60Ni,and 61Ni foil samples were prepared and mounted at the sample changer of the GIC.Three highly enriched 238U3O8 samples inside the GIC were used to determine the relative and absolute neutron fluxes.The neutron energy spectra were obtained through unfolding the pulse height spectra measured by the EJ-309 liquid scintillator.The interference from the low-energy neutrons and impurities in the samples has been corrected.The present data of the 60Ni(n,α)57Fe reaction are the first measurement results below 6.0 MeV,and those of the 61Ni(n,α)58Fe reactions are the first measurement results in the MeV region.The present results have been compared with existing measurements,evaluations,and TALYS-1.9 calculations.
基金Supported by the National Natural Science Foundation of China(11775006)China Nuclear Data Center and the Science and Technology on Nuclear Data Laboratory.
文摘Cross sections of the^(58,60,61)Ni(n,α)^(55,57,58)Fe reactions were measured at 8.50,9.50 and 10.50 MeV neutron energies based on the HI-13 tandem accelerator of China Institute of Atomic Energy(CIAE)with enriched^(58)Ni,^(60)Ni,and^(61)Ni foil samples with backings.A twin gridded ionization chamber(GIC)was used as the charged particle detector,and an EJ-309 liquid scintillator was used to obtain the neutron energy spectra.The relative and absolute neutron fluxes were determined via three highly enriched^(238)U_(3)O_(8)samples inside the GIC.The uncertainty of the present data of the^(58)Ni(n,α)^(55)Fe reaction is smaller than most existing measurements.The present data of^(60)Ni(n,α)^(57)Fe and^(61)Ni(n,α)^(58)Fe reactions are the first measurement results above 8 MeV.The present experimental data could be reasonably reproduced by calculations with TALYS-1.9 by adjusting several default values of theoretical model parameters.
