1. On decay constants and orbital distance to the Sun—part III: beta plus and electron capture decay
- Author
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M. Bruggeman, Karsten Kossert, Timotheos Altzitzoglou, Stefaan Pommé, J. Lubbe, J. Golya, Youcef Nedjadi, Raphael Galea, R. Van Ammel, A. Ceccatelli, Mikael Hult, S. Bourke, H. Schrader, C Michotte, M.-N. Amiot, Matjaž Korun, W.M. van Wyngaardt, S Courte, Aldo Fazio, V. Chisté, M. I. Reinhard, H. Stroh, L. Verheyen, Branko Vodenik, Claude Bailat, M. Marouli, T. W. Jackson, P. De Felice, K.M. Ferreira, Frédéric Juget, B.R.S. Simpson, Sean Collins, François Bochud, J. Paepen, M.W. van Rooy, John Keightley, Ole Nähle, T. Buchillier, M.J. van Staden, T. Roy, JRC Institute for Reference Materials and Measurements [Geel] (IRMM), European Commission - Joint Research Centre [Geel] (JRC), Physikalisch-Technische Bundesanstalt [Braunschweig] (PTB), Institut Universitaire de Radiophysique Appliquée, Bureau International des Poids et Mesures (BIPM), National Metrology Institute of South Africa, Agenzia Nazionale per le nuove Tecnologie, l’energia e lo sviluppo economico sostenibile (ENEA), Australian Nuclear Science and Technology Organisation [Australie] (ANSTO), National Research Council of Canada (NRC), National Physical Laboratory [Teddington] (NPL), International Atomic Energy Agency [Vienna] (IAEA), Centre d'Etude de l'Energie Nucléaire (SCK-CEN), Jozef Stefan Institute [Ljubljana] (IJS), Laboratoire National Henri Becquerel (LNHB), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, De Felice, P., Fazio, A., Agenzia Nazionale per le nuove Tecnologie, l’energia e lo sviluppo economico sostenibile = Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département d'instrumentation Numérique (DIN (CEA-LIST)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
- Subjects
Electron capture ,UNCERTAINTY ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,010403 inorganic & nuclear chemistry ,7. Clean energy ,01 natural sciences ,neutrino ,0103 physical sciences ,Exponential decay ,010303 astronomy & astrophysics ,Engineering(all) ,Physics ,Radionuclide ,half-life ,decay constant ,Sun ,uncertainty ,radioactivity ,HALF-LIFE ,GAMMA-RAY SPECTROMETRY ,IONIZATION-CHAMBER ,General Engineering ,Half-life ,SOLAR INFLUENCE ,Beta decay ,0104 chemical sciences ,Amplitude ,13. Climate action ,Neutrino ,Atomic physics ,Radioactive decay - Abstract
International audience; 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 Na-22, Mn-54, Fe-55, Co-57, Zn-65, Sr82+85, Sr-90, Cd-109, Sb-124, Ba-133, Eu-152, and Bi-207 sources were repeated over periods from 200 d 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.
- Published
- 2016