Abstract
Energy and velocity spectra, angular and mass distributions have been measured for evaporation residue products of the20, 22Ne+27Al system in the energy range ofE L (20Ne)=51 to 395 MeV and in the angular rangeθ=2° and 30°. Calculations with simple assumptions of the velocity and angular distributions of the evaporation residues are presented and compared to the data. The structure seen in the mass distributions, a competition between α-particle and nucleon evaporation in the deexcitation of the compound nucleus, is described well by calculations with the computer code CASCADE. The evaporation residues exhibit mass distributions varying systematically as a function of the excitation energy. The excitation function of the evaporation residue cross section is compared with theoretical models. At higher incident energies contributions of incomplete momentum transfer (incomplete fusion) are observed. A limitation for complete compound nucleus formation with following light particle evaporation is found.
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The authors thank K.H. Lindenberger for his interest and support of the present investigation. Fruitful discussions with D. Hilscher, W. von Oertzen, H.J. Krappe, U. Jahnke, H. Rossner, W. Galster and the help of C. Egelhaaf and M. Bürgel in the experimental data analysis are gratefully acknowledged.
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Morgenstern, H., Bohne, W., Grabisch, K. et al. Formation and decay of the compound nucleus studied in the reaction20Ne+27Al. Z Physik A 313, 39–49 (1983). https://doi.org/10.1007/BF02115841
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DOI: https://doi.org/10.1007/BF02115841