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

Abstract

We apply the generalized Lomb-Scargle (LS) periodogram to independently confirm the claim by Sturrock et al (arXiv:1605.03088) of oscillation at a frequency of 11/year in the decay rates of ${}^{90}\mathrm{Sr}{/}^{90}\mathrm{Y}$ from measurements at the Physikalisch Technische Bundesanstalt (PTB), which however has been disputed by Kossert and Nahle (arXiv:1407.2493). For this analysis, we made two different {\it 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 ${}^{90}\mathrm{Sr}{/}^{90}\mathrm{Y}$ data for two of the three samples, but at a lower significance than that claimed by Sturrock et al.

9 pages, 9 figures

References in corpus (7)

• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• Understanding the Lomb-Scargle Periodogram
• Introduction to astroML: Machine Learning for Astrophysics
• Disproof of solar influence on the decay rates of 90Sr/90Y
• Statistical Significance of spectral lag transition in GRB 160625B
• Search for time modulations in the decay constant of 40K and 226Ra at the underground Gran Sasso Laboratory
• Investigating Light Curve Modulation via Kernel Smoothing. I. Application to 53 fundamental mode and first-overtone Cepheids in the LMC

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