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arXiv · 1006.4848

Power Spectrum Analysis of BNL Decay-Rate Data

P. A. Sturrock·J. B. Buncher·E. Fischbach·J. T. Gruenwald·D. Javorsek II·J. H. Jenkins·R. H. Lee·J. J. Mattes·J. R. Newport
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Abstract

Evidence for an anomalous annual periodicity in certain nuclear decay data has led to speculation concerning a possible solar influence on nuclear processes. As a test of this hypothesis, we here search for evidence in decay data that might be indicative of a process involving solar rotation, focusing on data for 32Si and 36Cl decay rates acquired at the Brookhaven National Laboratory. Examination of the power spectrum over a range of frequencies (10 - 15 year^-1) appropriate for solar synodic rotation rates reveals several periodicities, the most prominent being one at 11.18 year^-1 with power 20.76. We evaluate the significance of this peak in terms of the false-alarm probability, by means of the shuffle test, and also by means of a new test (the "shake" test) that involves small random time displacements. The last two tests indicate that the peak at 11.18 year^-1 would arise by chance only once out of about 10^7 trials. Since there are several peaks in the search band, we also investigate the running mean of the power spectrum, and identify a major peak at 11.93 year^-1 with peak running-mean power 4.08. Application of the shuffle test and the shake test indicates that there is less than one chance in 10^11, and one chance in 10^15, respectively, finding by chance a value as large as 4.08.

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P. A. Sturrock, J. B. Buncher, E. Fischbach, J. T. Gruenwald, D. Javorsek II, J. H. Jenkins, R. H. Lee, J. J. Mattes, J. R. Newport. 2010-06-24. Power Spectrum Analysis of BNL Decay-Rate Data. https://doi.org/10.1016/j.astropartphys.2010.06.004

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