Generalized Lomb–Scargle analysis of $$\mathrm {^{90}Sr/^{90}Y}$$90Sr/90Y decay rate measurements from the Physikalisch–Technische Bundesanstalt

P, Tejas and Desai, Shantanu (2018) Generalized Lomb–Scargle analysis of $$\mathrm {^{90}Sr/^{90}Y}$$90Sr/90Y decay rate measurements from the Physikalisch–Technische Bundesanstalt. The European Physical Journal C, 78 (7). pp. 1-8. ISSN 1434-6044

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Abstract

We apply the generalized Lomb–Scargle (LS) periodogram to independently confirm the claim by Sturrock et al. (Astropart Phys 84:8. https://doi.org/10.1016/j.astropartphys.2016.07.005, 2016) of an oscillation at a frequency of 11/year in the decay rates of 90Sr / 90Y from measurements at the Physikalisch Technische Bundesanstalt (PTB), which however has been disputed by Kossert and Nahle (Astropart Phys 69:18. https://doi.org/10.1016/j.astropartphys.2015.03.003, 2015). For this analysis, we made two different ansatze for the errors. For each peak in the LS periodogram, we evaluate the statistical significance using non-parametric bootstrap resampling. We find using both of these error models evidence for 11/year periodicity in the 90Sr / 90Y data for two of the three samples, but at a lower significance than claimed by Sturrock et al. [1].

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