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Recently, Pomme et al did an analysis of $\rm{^{36}Cl} $ radioactive decaydata from measurements at the Physikalisch-Technische Bundesanstalt (PTB), inorder to verify the claims by Sturrock and collaborators of an influence onbeta-decay rates measured at Brookehaven National Lab (BNL) due to therotation-induced modulation of the solar neutrino flux. Their analysis excludedany sinusoidal modulations in the frequency range from 0.2-20/year. We carryout an independent analysis of the same PTB and BNL data using the generalizedLomb-Scargle periodogram, to look for any statistically significant peaks inthe range from 0 to 14 per year, and by evaluating the significance of everypeak using multiple methods. Our results for the PTB data are in agreement withthose by Pomme et al. For BNL data, we do find peaks at some of the samefrequencies as Sturrock et al, but the significance is much lower. All ouranalysis codes and datasets have been made publicly available.

Generalized Lomb-Scargle analysis of $\rm{^{36}Cl}$ decay rate measurements at PTB and BNL