Abstract
The effects of target-atom vibrations on nuclear reaction kinetics have been examined. In particular, Doppler broadening of resonance-type and elastic-scattering reactions has been considered in detail. Depending on the specific process parameters, the resulting energy widths can be many orders of magnitude larger than the energies of the vibrational states of the target solid. Comparison of experimental results on a hydrogen-bearing thin target with the theoretical predictions shows excellent agreement.
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We want to thank Prof. H.A. Weidenmüller, Heidelberg, for his comments on the treatment of ensembles of randomly oriented oscillators, and Prof. G. Amsel, Paris, for his stimulating discussions on the Doppler effect. Mr. V. Kößler and Mr. R. Pfahler supported this work by providing the excellent working conditions at the Heidelberg EN-tandem accelerator. We are grateful to Dr. H. Baumann, Frankfurt, for runs on the 7 MV accelerator. Both Profs. R.G. Stokstad, on leave from Berkeley, and U. Schmidt-Rohr, Heidelberg, drew our attention to the feasibility of analyzing the knocked out target nucleus with respect to the Doppler effect.