Evidence against solar influence on nuclear decay constants

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DOIResolve DOI: http://doi.org/10.1016/j.physletb.2016.08.038
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TypeArticle
Journal titlePhysics Letters B
ISSN0370-2693
Volume761
Pages281286
Subjecthalf-life; decay constant; uncertainty; radioactivity; Sun; neutrino
AbstractThe hypothesis that proximity to the Sun causes variation of decay constants at permille level has been tested and disproved. Repeated activity measurements of mono-radionuclide sources were performed over periods from 200 days up to four decades at 14 laboratories across the globe. Residuals from the exponential nuclear decay curves were inspected for annual oscillations. Systematic deviations from a purely exponential decay curve differ from one data set to another and are attributable to instabilities in the instrumentation and measurement conditions. The most stable activity measurements of alpha, beta-minus, electron capture, and beta-plus decaying sources set an upper limit of 0.0006% to 0.008% to the amplitude of annual oscillations in the decay rate. Oscillations in phase with Earth's orbital distance to the Sun could not be observed within a 10−6 to 10−5 range of precision. There are also no apparent modulations over periods of weeks or months. Consequently, there is no indication of a natural impediment against sub-permille accuracy in half-life determinations, renormalisation of activity to a distant reference date, application of nuclear dating for archaeology, geo- and cosmochronology, nor in establishing the SI unit becquerel and seeking international equivalence of activity standards.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationNational Research Council Canada; Measurement Science and Standards
Peer reviewedYes
NPARC number23002544
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Record identifiera9e38814-cd50-42da-a089-5c63e0688e09
Record created2017-11-27
Record modified2017-11-27
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