2010•International Journal of Modern Physics ERequires access

THE FISSION BARRIERS OF HEAVY AND EXOTIC NUCLEI

F. A. Ivanyuk, K. Pomorski

Abstract

We have calculated the liquid drop fission barriers of medium and heavy nuclei within the Lublin-Strasbourg-Drop model. Exploiting in addition the topographical theorem by Myers and Światecki we propose a simple but quite accurate approximation of the fission barrier heights. When comparing the r.m.s. deviation of approximated versus experimental values of fission barrier heights for known nuclei with Z > 70 a value 1.1 MeV is obtained which is comparable with the experimental uncertainties. The Strutinsky optimal shape method is generalized to the left-right asymmetric shapes of nuclei in order to investigate the influence of this degree of freedom on the barrier heights.

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Key concepts: Fission, Semi-empirical mass formula, Liquid drop, Drop (telecommunication), Physics, Nuclear physics, Degrees of freedom (physics and chemistry), Nuclear fission