2010/10/11 by P. A. Sturrock, J. B. Buncher, John B. Buncher +10 · 2 citations
Decision Sciences · Health Professions · Physics and Astronomy · #Radioactive Decay and Measurement Techniques #Radioactivity and Radon Measurements #Scientific Measurement and Uncertainty Evaluation #astro-ph.SR #nucl-ex #physics.ins-det
paper · pdf · doi:10.1007/s11207-010-9659-4
published as Solar Physics, 2010. 267(2): p. 251-265 · 15 pages, 13 figures
arxiv created 2010/10/11 · openalex publication_date 2010/11/16 · arxiv updated 2011/02/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
Evidence for an anomalous annual periodicity in certain nuclear decay data has led to speculation concerning a possible solar influence on nuclear processes. We have recently analyzed data concerning the decay rates of Cl-36 and Si-32, acquired at the Brookhaven National Laboratory (BNL), to search for evidence that might be indicative of a process involving solar rotation. Smoothing of the power spectrum by weighted-running-mean analysis leads to a significant peak at frequency 11.18/yr, which is lower than the equatorial synodic rotation rates of the convection and radiative zones. This article concerns measurements of the decay rates of Ra-226 acquired at the Physikalisch-Technische Bundesanstalt (PTB) in Germany. We find that a similar (but not identical) analysis yields a significant peak in the PTB dataset at frequency 11.21/yr, and a peak in the BNL dataset at 11.25/yr. The change in the BNL result is not significant since the uncertainties in the BNL and PTB analyses are estimated to be 0.13/yr and 0.07/yr, respectively. Combining the two running means by forming the joint power statistic leads to a highly significant peak at frequency 11.23/yr. We comment briefly on the possible implications of these results for solar physics and for particle physics.