Abstract
We study the effects of coupling between the fission coordinate and bosonic intrinsic excitations on the fission width by using a path integral method. We assume a general coupling form factor and discuss how the decay width at high temperature changes from that of the extended Kramers formula recently obtained in the bilinear coupling model. Applying the results to two different types of bosonic spectra we show a possibility to represent the effects of nonlinearity of the coupling in terms of a suitable renormalization of the friction and the mass for the fission coordinate.
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