Determination of thermal neutron cross-section and resonance integral for the 75As (n, γ)76As reaction by activation method using 55Mn (n, γ)56Mn as a monitor

摘要: Abstract Nuclear constants for use in reactor activation analysis especially (n, γ) cross-sections and absolute gamma intensities, are known to show a rather large scatter literature. Thermal resonance the 75As γ)76As reaction is determined by method of foil using 55Mn γ)56Mn as reference reaction. The experimental sample with without cadmium cover 1-mm wall thickness was irradiated isotropic neutron field outer irradiation sites 7 Ghana Research Reactor-1 facility which miniature source designed Chinese. channel used has spectral parameter (α) found be (0.037 ± 0.001). induced activity measured ray spectrometry high purity germanium detector. A standard solution Arsenic analysis. necessary correction attenuation, thermal neutrons self-shielding effects were not taken into account during because they negligible. By defining cut-off energy 0.55 eV, result be: cross-section σ0 = (4.28 ± 0.19) b integral I0 = (61.88 ± 1.07) b.