Abstract
We have analysed a certain number of nuclear reactions for medium and light nuclei (10<Z<40), particularly (n, p) reactions with 14 MeV neutrons. The expressionn(ɛ)/ɛσ*, which is proportional to the nuclear level density, is represented fairly well, forɛ in the range (4÷10) MeV, by an exponential law of the kindee/θ, beingθ=(1÷1.2) MeV for medium nuclei (20<Z<40) andθ=1.45 for lighter nuclei.σ* has been calculated assumingr0=1.4·10−13 cm for neutrons andr0=1.6·10−13 cm for protons. On such a basis the ratioσ(n, p)/σ(n, nI) is in good agreement with the evaporative model when one considers theQ values of the reaction and the fact that the residual nucleus is even-even or odd-odd. From such ratio, calculated for evenA nuclei, it is possible to obtain values of the pairing energyA in good agreement with that calculated by Cameron. Also for (n, 2n), (n, np) and (p, n) reactions on medium nuclei, the evaporative model gives satisfactory results for the interpretation of the cross-section variations.
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