Evidence for a Solar Influence on Nuclear Decay Rates

Details Evidence for a Solar Influence on Nuclear Decay Rates Evidence for a Solar Influence on Nuclear Decay Rates

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640011s&link_type=abstract

American Astronomical Society, AAS Meeting #216, #400.11; Bulletin of the American Astronomical Society, Vol. 41, p.856

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Scientific paper

Analyses of data acquired during two experiments at the Brookhaven National Laboratory (BNL) and one at the Physikalisch-Technische Bundesanstalt in Germany have yielded strong evidence for an annual variation of some nuclear decay rates. Since the Sun-Earth distance has an annual period, it is possible that some radiation from the Sun plays a role. We here present evidence in support of this conjecture.
The low-energy solar-neutrino flux as detected by the Homestake and GALLEX experiments, and the total solar irradiance as measured by the ACRIM experiment, both exhibit a periodicity of about 12 year-1. We infer that the solar core rotates at this synodic frequency, and that nuclear burning in the core is not spherically symmetric. If neutrinos influence some decay rates, the same periodicity may be manifested in decay measurements.
We have for this reason carried out a power-spectrum analysis of measurements made at BNL over a 7-year interval of the decay rates of 32Si and 36Cl. This analysis yields strong evidence for a cluster of periodicities centered on 12 year-1, such as one might obtain from stochastic fluctuations of nuclear burning in a rotating core.
These results imply that some nuclear decay rates are influenced either by solar neutrinos or by some other form of radiation that has its origin in the solar core.
This work was supported by the NSF grant AST-0607572 and DOE grant DE-AC-02-76ER071428.

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