Spectral Content of 22Na/44Ti Decay Data: Implications for a Solar Influence

Abstract

We report a reanalysis of data on the measured decay rate ratio ${}^{22}$Na/${}^{44}$Ti which were originally published by Norman et al., and interpreted as supporting the conventional hypothesis that nuclear decay rates are constant and not affected by outside influences. We find upon a more detailed analysis of both the amplitude and the phase of the Norman data that they actually favor the presence of an annual variation in ${}^{22}$Na/${}^{44}$Ti, albeit weakly. Moreover, this conclusion holds for a broad range of parameters describing the amplitude and phase of an annual sinusoidal variation in these data. The results from this and related analyses underscore the growing importance of phase considerations in understanding the possible influence of the Sun on nuclear decays. Our conclusions with respect to the phase of the Norman data are consistent with independent analyses of solar neutrino data obtained at Super-Kamiokande-I and the Sudbury Neutrino Observatory (SNO).

9 pages, 5 figures, accepted for publication in Astrophysics and Space Science December 2012

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• Indications of an unexpected signal associated with the GW170817 binary neutron star inspiral
• Precision long-term measurements of beta-decay-rate ratios in a controlled environment
• A Precision Experiment to Investigate Long-Lived Radioactive Decays
• Search for Possible Solar Influences in Ra-226 Decays
• Influence of solar flares on behavior of solar neutrino flux
• Generalized Lomb-Scargle analysis of ${}^{123}\mathrm{I}$ and ${}^{99m}\mathrm{Tc}$ decay rate measurements
• Test of Nuclear Decay Rate Variation due to an Antineutrino Flux