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Experiments showing a seasonal variation of the nuclear decay rates of anumber of different nuclei, and decay anomalies apparently related to solarflares and solar rotation, have suggested that the Sun may somehow beinfluencing nuclear decay processes. Recently, Cooper searched for such aneffect in $^{238}$Pu nuclei contained in the radioisotope thermoelectricgenerators (RTGs) on board the Cassini spacecraft. In this paper we modify andextend Cooper's analysis to obtain constraints on anomalous decays of$^{238}$Pu over a wider range of models, but these limits cannot be applied toother nuclei if the anomaly is composition-dependent. We also show that it mayrequire very high sensitivity for terrestrial experiments to discriminate amongsome models if such a decay anomaly exists, motivating the consideration offuture spacecraft experiments which would require less precision.

Searches for solar-influenced radioactive decay anomalies using Spacecraft RTGs