Abstract
The fast neutron capture in silicon, sulphur and calcium was studied using the recently proposed consistent version of the direct-semi-direct capture model. We present the calculation of excitation functions and integrated cross sections for the reactions 28Si( n, γ) 29Si, 32S( n, γ) 33S and 40Ca( n, γ) 41Ca. The selected target nuclei having the same number of neutrons and protons are suitable for the study of isospin conservation rules which strongly influence the transition amplitudes. It is shown that the energy-weighted photo-nuclear cross sections should be reduced due to the isospin selection rules and that consistent reproduction of the experimental excitation functions and integrated cross sections is obtained in all the cases studied.
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