http://arxiv.org/abs/1801.03236
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 $\rm{^{90}Sr/^{90}Y}$ 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 these error models that none of the peaks in the LS periodogram are statistically significant, thus invalidating the claim by Sturrock et al of any oscillations in the decay rates.
P. Tejas and S. Desai
Thu, 11 Jan 18
23/56
Comments: 7 pages, 7 figures