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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

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by Sogbadji, R.B.M. (National Nuclear Research Institute, P.O. Box AE1, Atomic Energy, Accra (Ghana)); Nyarko, B.J.B.; Akaho, E.H.K. (Ghana Atomic Energy Commission, National Nuclear Research Institute, P.O. Box LG80, Legon (Ghana)); Abrefah, R.G. (National Nuclear Research Institute, P.O. Box AE1, Atomic Energy, Accra (Ghana)), E-mail: robertmawuko@yahoo.com 

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

Source/Report: Nuclear Engineering and Design; v. 240(5); ISSN 0029-5493; Worldcat; CODEN NEDEAU; May 2010; p. 980-984; S0029-5493(10)00006-3; Available from http://dx.doi.org/10.1016/j.nucengdes.2009.12.020; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)

Publ. Year: 2010

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