Abstract
Studies of the reactions Br(n, α), Rb(n, α) and Rb(n, p) for neutron energies of 13 to 17 MeV are presented. An experimental set up is used in which the target also acts as a detector. The reactions occur in CsBr(Tl) and RbI(Tl) scintillation crystals, both of which allow discrimination of different kinds of particles by pulse-shape discrimination. For all the reactions, cross sections are evaluated, and for the Br(n, α) reaction the energy spectra are measured. The experimental data of the (n, α) reactions are compared with the prediction of the statistical theory of nuclear reactions. By analysis of the energy spectra the fraction of α-particles which are produced in an evaporation process is calculated. This fraction matches the theoretically computed cross section very well. The comparison of these cross sections with similar measurements in the range of 14 to 15 Mev neutron energy gives evidence that the intense increase of the (n, α) cross sections for nuclei with an N value close to the magic neutron number N = 50 does not occur; such an increase has been assumed up to now.
Published Version
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