Sensitivity of the evaporation residue production to dynamical effects in highly fissile compound nuclei

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Abstract

We investigate the sensitivity of statistical model calculations of individual evaporation residue (ER) production on the nuclear shape evolution and viscosity. To this aim we analyze the de-excitation of the 217Ac compound nucleus formed at the excitation energies between 36 and 90 MeV. We find a strong dependence of the calculated results on the nuclear dissipation and shape evolution, which make evaporation residues a useful tool for investigating dynamical effects. We indicate a new method of estimating the nuclear viscosity and claim that the statistical model interpretation of the ER's does not exclude high values for the viscosity parameter.

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  • This work was supported by the Istituto Nazionale di Fisica Nucleare, Ministero dell'Universitàe della Ricerca Scientifica e Tecnologica.

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    We wish to thank Dr. L. Hobbins for useful suggestions during the revision of the English text. We also acknowledge A. Sierk for making the rountine BARMOM available.

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