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On decay constants and orbital distance to the Sun—part III: beta plus and electron capture decay
- Source :
- Metrologia, Metrologia, IOP Publishing, 2017, 54 (1), pp.36-50. ⟨10.1088/1681-7575/54/1/36⟩, Metrologia, vol. 54, no. 1, pp. 36-50, Metrologia, 2017, 54 (1), pp.36-50. ⟨10.1088/1681-7575/54/1/36⟩
- Publication Year :
- 2016
- Publisher :
- IOP Publishing, 2016.
-
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.
- 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
Subjects
Details
- ISSN :
- 16817575 and 00261394
- Volume :
- 54
- Database :
- OpenAIRE
- Journal :
- Metrologia
- Accession number :
- edsair.doi.dedup.....f87b3b960f3f65b2c3532dcffdad995c