Title: On decay constants and orbital distance to the Sun – Part II: Beta minus 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. 19
Publisher: IOP PUBLISHING LTD
Publication Year: 2017
JRC N°: JRC103199
ISSN: 0026-1394
URI: http://iopscience.iop.org/article/10.1088/1681-7575/54/1/19
http://publications.jrc.ec.europa.eu/repository/handle/JRC103199
DOI: 10.1088/1681-7575/54/1/19
Type: Articles in periodicals and books
Abstract: Claims that proximity to the Sun causes variations of decay constants at the permille level have been investigated for beta-minus decaying nuclides. Repeated activity measurements of 3H, 14C, 60Co, 85Kr, 90Sr, 124Sb, 134Cs, 137Cs, and 154Eu sources were performed over periods of 259 days up to 5 decades at various nuclear metrology institutes. Residuals from the exponential decay curves were inspected for annual oscillations. Systematic deviations from a purely exponential decay curve differ in amplitude and phase 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-minus decaying sources set an upper limit of 0.003%-0.007% 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.