Elsevier

Annals of Physics

Volume 62, Issue 2, February 1971, Pages 464-491
Annals of Physics

Fission and the ion-ion interaction

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Abstract

A fission theory based on a preformation probability and the decay of the daughter pair through their associated ion-ion potential is presented. The preformation probability is estimated to be 10−5. The nuclear component of ion-ion potential is determined in a sudden approximation by superposing the ground state densities of the daughter pair and is found to be 60–70 MeV deep. Using observed kinetic energies, absolute lifetimes are calculated for both symmetric and asymmetric fission of U234, Pu240, Cm244, and Cf248 with good results. In addition, the absolute lifetimes associated with the decay of Pu240 into a series of other modes are presented. The relevance of this theory to the isotopic dependence of lifetimes, prompt neutron fission, and subthreshold fission is discussed in qualitative terms. Thus the nuclear fission seems to be a sudden process.

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