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I. Fission Probabilities, Fission Barriers, and Shell Effects. II. Particle211 Structure Functions

机译：I.裂变概率，裂变障碍和壳效应。 II。 particle211结构函数

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A nucleus behaves very much like a liquid drop. A hot nuclear droplet, heated211u001ethrough mechanisms such as compound nucleus formation, will cool itself by either 211u001eevaporating light particles, or changing its shape and managing to split into two 211u001esmaller droplets of complementary sizes. The latter process, called nuclear 211u001efission, is the main theme of this thesis. The most probable paths a nucleus may 211u001etake on the way to fission pass over a saddle point in its potential energy 211u001esurface. The rate for fission to occur is determined at the saddle point and is 211u001econtrolled by its height. The fission barrier, defined as the saddle point 211u001eheight, thus plays a central role in understanding fission probabilities. The 211u001eexperimental studies of fission probabilities in turn provide us the means to 211u001edetermine the fission barrier. In Part II, we report on a search for evidence of 211u001ethe optical modulations in the energy spectra of alpha particles emitted from hot 211u001ecompound nuclei. The optical modulations are expected to arise from the alpha-211u001eparticle interaction with the rest of the nucleus as the particle prepares to 211u001eexit.

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