Power Spectrum Analysis of BNL Decay-Rate Data
| Autor: | J. R. Newport, R. H. Lee, J. B. Buncher, Ephraim Fischbach, D. Javorsek, Peter A. Sturrock, Jere H. Jenkins, J. T. Gruenwald, J. J. Mattes |
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| Rok vydání: | 2010 |
| Předmět: |
Physics
Stochastic process Solar neutrino Spectral density FOS: Physical sciences Astronomy and Astrophysics Shake Astrophysics Solar irradiance High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Astrophysics - Solar and Stellar Astrophysics Solar rotation Neutrino Radioactive decay Solar and Stellar Astrophysics (astro-ph.SR) |
| DOI: | 10.48550/arxiv.1006.4848 |
| Popis: | 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. Comment: 12 pages, 17 figures, to be published in Astroparticle Physics |
| Databáze: | OpenAIRE |
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