Abstract

A derivation is presented of the quasi-exponential law of radioactive decay which avoids the standard «essential states» approximation (neglect of final-state interactions) and also relaxes the approximation that the density of final states be a constant (with a cut-off). It is found that the system decays as a sum of exponentials with a single term dominant at sufficiently long time. The decay constant is changed slightly from that which obtains under the essential-state approximation.

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