Title: On decay constants and orbital distance to the Sun – Part III: Beta plus and electron capture decay
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.VERHEYEN L.BRUGGEMAN M.VODENIK BrankoKORUN M.CHISTE V.AMIOT M.-N.
Citation: METROLOGIA vol. 54 no. 1 p. 36-50
Publisher: IOP PUBLISHING LTD
Publication Year: 2017
JRC N°: JRC103200
ISSN: 0026-1394
URI: http://iopscience.iop.org/article/10.1088/1681-7575/54/1/36
http://publications.jrc.ec.europa.eu/repository/handle/JRC103200
DOI: 10.1088/1681-7575/54/1/36
Type: Articles in periodicals and books
Abstract: The hypothesis that seasonal changes in proximity to the Sun cause variation of decay constants at permille level has been tested for radionuclides disintegrating through electron capture and beta plus decay. Activity measurements of 22Na, 54Mn, 55Fe, 57Co, 65Zn, 82+85Sr, 90Sr, 109Cd, 124Sb, 133Ba, 152Eu, and 207Bi sources were repeated over periods from 200 days up to more than 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 appear attributable to instabilities in the instrumentation and measurement conditions. Oscillations in phase with Earth's orbital distance to the sun could not be observed within 10-4-10-5 range precision. The most stable activity measurements of beta+ and EC decaying sources set an upper limit of 0.006% or less to the amplitude of annual oscillations in the decay rate. There are no apparent indications for systematic oscillations at a level of weeks or months.
JRC Directorate:Nuclear Safety and Security

Files in This Item:
There are no files associated with this item.


Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.