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Upon increasing significantly the nuclear elongation, the beta-decay energygrows. This paper investigates within a simple yet partly microscopic approach,the transition rate of the beta decay of the 252Cf nucleus on the way toscission from the exit point for a spontaneous fission process. A rather crudeclassical approximation is made for the corresponding damped collective motionassumed to be one dimensional. Given these assumptions, we only aim in thispaper at providing the order of magnitudes of such a phenomenon. At eachdeformation the energy available for beta decay, is determined from such adynamical treatment. Then, for a given elongation, transition rates for theallowed (Fermi) beta decay are calculated from pair correlated wave functionsobtained within a macroscopic-microscopic approach and then integrated over thetime corresponding to the whole descent from exit to scission. The results arepresented as a function of the damping factor (inverse of the characteristicdamping time) in use in our classical dynamical approach. For instance, in thecase of a descent time from the exit to the scission points of about $10^{-20}$ second, one finds a total rate of beta decay corresponding roughly to 20events per year and per milligram of 252Cf. The inclusion of pairingcorrelations does not affect much these results.

Beta decay of 252Cf on the way to scission from the exit point