SN Validation of JEF-1 Data on the PCA-Replica Shielding Benchmark

Thermal neutron cross-section and resonance integral for 164Dy(n,γ)165Dy reaction

“…The irradiation times for the (n,g) reactions of 55 Mn and 164 Dy were chosen for a period of three to six half lives, yielding enough activity to be measured in a g-ray counting system. The suitable waiting times were employed to minimize dead time losses and eliminate the possible contribution of 843.8 keV g-ray from 27 Mg (9.45 m) activity to the 846.7 keV peak of 56 Mn.…”

“…In the present work, the thermal neutron crosssection for the reaction 164 Dy(n,g) 165 Dy has been determined relative to that for the 55 Mn(n,g) 56 Mn reaction. In Eq.…”

“…where g is the correction for departure from 1/v cross-section behavior, G th is the self-shielding Table 1 Nuclear decay data used for the determination of the radioactivities for neutron flux and cross-section measurement [23] Nuclear reaction Half-life (h) Detected g-ray Energy (keV) Intensity (%) 55 Mn(n,g) 56 (3) 3.6(4) 361.68 (2) 0.84 (9) factor for thermal neutrons, s 0 is monitor thermal neutron cross-section, F Cd is cadmium correction factor, R and R Cd are the reaction rates per atom for bare and Cd-covered isotope irradiations, respectively. R and R Cd are determined by…”

“…The aim of the present work is to measure mainly resonance integral for the 164 Dy(n,g) 165 Dy reaction by activation method, using cadmium ratios, relative to 55 Mn(n,g) 56 Mn reaction as a single comparator, instead of conventional 197 Au(n,g) 198 Au monitor reaction. In the present measurements, the oxide form of the Dy was diluted sufficiently so as to minimize errors due to neutron self-shielding effect and then irradiated in an isotropic neutron field of the 241 Am-Be neutron sources.…”

“…The well-separated principal resonance energy of Au monitor lies in 4.9 eV, whereas the first resonance of 55 Mn lies in 337 eV and it is quite far from 1/v region. Therefore, the 55 Mn(n,g) 56 Mn reaction can also be chosen as a suitable comparator for thermal neutron crosssection and resonance integral measurements [19][20][21].…”