On decay constants and orbital distance to the Sun. Part III: beta plus and electron capture decay

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DOI	Resolve DOI: https://doi.org/10.1088/1681-7575/54/1/36
Author	Search for: Pommé, S.; Search for: Stroh, H.; Search for: Paepen, J.; Search for: Van Ammel, R.; Search for: Marouli, M.; Search for: Altzitzoglou, T.; Search for: Hult, M.; Search for: Kossert, K.; Search for: Nähle, O.; Search for: Schrader, H.; Search for: Juget, F.; Search for: Bailat, C.; Search for: Nedjadi, Y.; Search for: Bochud, F.; Search for: Buchillier, T.; Search for: Michotte, C.; Search for: Courte, S.; Search for: Van Rooy, M. W.; Search for: Van Staden, M. J.; Search for: Lubbe, J.; Search for: Simpson, B. R. S.; Search for: Fazio, A.; Search for: De Felice, P.; Search for: Jackson, T. W.; Search for: Van Wyngaardt, W. M.; Search for: Reinhard, M. I.; Search for: Golya, J.; Search for: Bourke, S.; Search for: Roy, T.¹; Search for: Galea, R.¹; Search for: Keightley, J. D.; Search for: Ferreira, K. M.; Search for: Collins, S. M.; Search for: Ceccatelli, A.; Search for: Verheyen, L.; Search for: Bruggeman, M.; Search for: Vodenik, B.; Search for: Korun, M.; Search for: Chisté, V.; Search for: Amiot, M.-N.
Affiliation	National Research Council of Canada. Measurement Science and Standards
Format	Text, Article
Subject	half-life; decay constant; uncertainty; radioactivity; Sun; neutrino
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 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 β + 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.
Publication date	2016-11-28
Publisher	IOP
In	Metrologia 54, no. 1: 36–50.
Language	English
Peer reviewed	Yes
NPARC number	23002365
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Record identifier	2807a0f5-71ae-438a-a595-9dc3563884c1
Record created	2017-10-23
Record modified	2020-05-30

Date modified:: 2024-09-18