Title: Evidence against solar influence on nuclear decay constants
Authors: POMME StefaanSTROH HEIKOPAEPEN JanVAN AMMEL RafMAROULI MARIAALTZITZOGLOU TimotheosHULT MikaelKOSSERT K.NÄHLE O.SCHRADER H.JUGET F.BAILAT C.NEDJADI Y.BOCHUD F.BUCHILLIER T.MICHOTTE C.COURTE SVAN ROOY M. W.VAN STADEN M. J.LUBBE J.SIMPSON B. R. S.FAZIO A.DE FELICE P.JACKSON T. W.VAN WYNGAARDT W. M.REINHARD M. I.GOLYA J.BOURKE S.ROY T.GALEA R.KEIGHTLEY J. D.FERREIRA K. M.COLLINS S. M.CECCATELLI A.UNTERWEGER M.FITZGERALD R.BERGERON D. E.PIBIDA LeticiaVERHEYEN L.BRUGGEMAN M.VODENIK BrankoKORUN M.CHISTE V.AMIOT M.-N.
Citation: PHYSICS LETTERS B vol. 761 p. 281-286
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2016
JRC N°: JRC101875
ISSN: 0370-2693
URI: http://www.sciencedirect.com/science/article/pii/S0370269316304580
http://publications.jrc.ec.europa.eu/repository/handle/JRC101875
DOI: 10.1016/j.physletb.2016.08.038
Type: Articles in periodicals and books
Abstract: The 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 10−610−6 to 10−510−5 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.
JRC Directorate:Nuclear Safety and Security

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