SSE Talks


Enigmatic Periodicities In Nuclear Processes
May 12, 2010 at 4:44 PM EST | P. STURROCK


Peter Sturrock


The decays of 32Si and 36Cl have been monitored over a period of four years at the Brookhaven National Laboratory, and the decays of 152Eu and 226Ra have been monitored for fifteen years at the Physikalisch-Technishe Bundesandstalt in Germany. The silicon and chlorine data both show evidence of an annual modulation, and the radium data show very strong evidence of such a modulation, with amplitude of order 0.015%. The phases of the modulations do not conform to what one would expect from a modulation due to the variation in Sun-Earth distance. However, they may perhaps be understood as the combined effect of the annual variation in the Sun-Earth-distance and the annual variation of the heliographic latitude of the Sun-Earth vector. We have previously found evidence that the solar neutrino flux is modulated according to the heliographic-latitude variation. The DAMA/LIBRA Consortium in Rome has recently announced the discovery of a similar annual variation in twelve years of data derived from sodium-iodide detectors, an effect that they attribute to the influence of dark matter. These results, if they are confirmed by future experiments, call into question our understanding of nuclear processes. This work was supported by NSF Grant No. AST-0607572.


Peter Sturrock is Emeritus Professor of Applied Physics at Stanford University, Emeritus President of SSE and Emeritus Editor of JSE, with wide interests currently spanning astrophysics, neutrino physics, Bayesian probability theory, the UFO problem, and the Shakespeare authorship issue.




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