A semiclassical technique is developed for calculating the angular and energy distributions of charged particles evaporated from deformed nuclei. It includes an analytical expression for particle momentum at infinity via its momentum at the emission point, which reasonably reproduces exact calculations, and a triangular weighting function for averaging over the cascade temperature. Essential reduction in computational effort is achieved due to a compact expression for emission widths and a phenomenological treatment of penetration through an aspherical barrier. The application of this technique to alpha -emission from strongly excited Yb isotopes with aligned spin has produced values of the deformation parameter which are in good agreement with liquid drop model calculations.
A semiclassical description is presented for light particle emission from composite system with a time-dependent shape. With nuclear shapes as a function of time taken from the Feldmeier one-body dissipation code we calculate the multiplicities of light particles accompanying fission for intermediate systems with A = 150-160 having excitation energies of 100 to 300 MeV. The calculations are consistent with experimental data for neutrons. For a good description of the charged particle multiplicities, one has to m u m e that particle separation energies reflect the structure of two nuclei making the composite system rather than that of the mononucleus.
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