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

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DOIResolve DOI: http://doi.org/10.1088/1681-7575/54/1/36
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TypeArticle
Journal titleMetrologia
ISSN0026-1394
1681-7575
Volume54
Issue1
Pages3650
Subjecthalf-life; decay constant; uncertainty; radioactivity; Sun; neutrino
AbstractThe 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
PublisherIOP
LanguageEnglish
AffiliationMeasurement Science and Standards; National Research Council Canada
Peer reviewedYes
NPARC number23002365
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Record identifier2807a0f5-71ae-438a-a595-9dc3563884c1
Record created2017-10-23
Record modified2017-10-23
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