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Cross sections of neutron-induced reactions on 103Rh have been calculated by means of the statistical model and the coupled-channels optical model for incident-neutron energies up to 30 MeV. The incentive for this study was a new measurement of the 103Rh(n,n′)103mRh cross section which will—together with the present calculations—enter into a dosimetry-reaction evaluation. The validation of the model parameters relied on nuclear-structure data as far as possible. Apart from the 103Rh(n,n′)103mRh excitation function also those for the 103Rh(n, 2n)102m,g,(m + g)Rh, 103Rh(n, 3n)101m,(m + g)Rh, 103Rh(n, p)103Ru and103Rh(n, α)100Tc reactions were calculated.

Reaction-model calculations of the cross sections of neutron-induced reactions on 23 Na have been carried out for incident energies up to 20 MeV. The work was mainly motivated by the interest in the 23 Na(n,2n) 22 Na reaction, for which conflicting experimental cross sections exist. The present study was aimed at the simultaneous description of the most recent data for the (n,2n) cross section together with the available experimental cross sections for other neutron-induced processes on 23 Na. The model parameters were determined from nuclear-structure information, as far as possible, and adjusted to reproduce the cross-section data.

A revision of previous statistical model calculations of neutron-induced cross sections of 93 Nb for incident energies between 0.3 and 20 MeV was performed. The motivation for the revision was the publication of new experimental data which were partially in disagreement with the last version of calculations. The present work describes the extended base of experimental data and the adjustment of model parameters and compares the resulting calculated cross sections with the corresponding measured ones.

Neutron-induced reaction cross sections for 93 Nb for incident energies between 0.3 and 20 MeV were calculated by means of the single-channel optical model and a combination of pre-equilibrium and Hauser-Feshbach model. The parameters entering into these models were chosen or adjusted so as to reproduce a large amount of experimental data. A description of this fit procedure, the resulting calculated cross sections and their comparison to the experimental data are presented.

The energy and angular distribution of the α-particles from the reaction 93Nb+n for 14.1-MeV incident neutron energy was measured by means of a multitelescope system. The angle-integrated results are in good agreement with existing experimental α-production spectra at 14 and 15 MeV bombarding energy, and with calculations based on the statistical model of nuclear reactions including precompound processes and second-chance particle emission. For these calculations, a parameter set was employed with which the cross sections of other neutron-induced reactions on 93Nb can also be described. For α-energies above 12 MeV, where precompound processes dominate, our angular distributions show larger forward-backward asymmetries than predicted by the systematics of precompound angular distributions of Kalbach and Mann (1980, 1981).