Additional experimental evidence for a solar influence on nuclear decay rates

Jenkins, Jere H.; Herminghuysen, Kevin; Blue, Thomas E.; Fischbach, Ephraim; Javorsek, D.; Kauffman, Andrew; Mundy, Daniel W.; Sturrock, P. A.; Talnagi, J.W.

doi:10.1016/j.astropartphys.2012.07.008

Cited by 38 publications

(30 citation statements)

References 44 publications

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“…Thus, the results show that other observations of oscillations (see, e.g., Ref. [5]) are due to ill-suited detectors rather than to solar influence or any other "new physics" [6].…”

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confidence: 94%

Disproof of solar influence on the decay rates of90Sr/90Y

Kossert

Nähle

2015

Astroparticle Physics

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A custom-built liquid scintillation counter was used for long-term measurements of 90Sr/90Y sources. The detector system is equipped with an automated sample changer and three photomultiplier tubes, which makes the application of the triple-to-double coincidence ratio (TDCR) method possible. After decay correction, the measured decay rates were found to be stable and no annual oscillation could be observed. Thus, the findings of this work are in strong contradiction to those of Parkhomov [1] who reported on annual oscillations when measuring 90Sr/90Y with a Geiger-M\"uller counter. Sturrock et al. [2] carried out a more detailed analysis of the experimental data from Parkhomov and claimed to have found correlations between the decay rates and processes inside the Sun. These findings are questionable, since they are based on inappropriate experimental data as is demonstrated in this work. A frequency analysis of our activity data does not show any significant periodicity.Comment: 11 pages, 9 figures, 1 tabl

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“…Thus, the results show that other observations of oscillations (see, e.g., Ref. [5]) are due to ill-suited detectors rather than to solar influence or any other "new physics" [6].…”

mentioning

confidence: 94%

Disproof of solar influence on the decay rates of90Sr/90Y

Kossert

Nähle

2015

Astroparticle Physics

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“…[3]). This analysis inspired many follow-up studies, some of which observe annual and more rapid variations [4,5,6,7,8,9,10,11,12,13,14,3,15,16,17,18,19,20], and some of which do not [21,22,23,24,25,26,27,28,29]. It has been suggested that decay rates are influenced by both the proximity and activity of the Sun.…”

Section: Introductionmentioning

confidence: 67%

Precision long-term measurements of beta-decay-rate ratios in a controlled environment

2017

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We report on measurements of relative beta-decay rates of Na-22, Cl-36, Co-60, Sr-90, Cs-137 monitored for more than one year. The radioactive samples are mounted in an automated sample changer that sequentially positions the five samples in turn, with high spatial precision, in front of each of four Geiger-Müller tubes. The sample wheel, detectors, and associated electronics are housed inside a sealed chamber held at constant absolute pressure, humidity, and temperature to isolate the experiment from environmental variations. The statistical uncertainty in the count rate approaches a few times 0.01% with two weeks of averaging. Other sources of error are on a similar scale. The data are analyzed in variety of ways, comparing count rates of the various samples on one or more detectors, and comparing count rates of a particular sample across multiple detectors. We observe no statistically significant variations in the ratios of decay rates, either annual or at higher-frequency, at a level above 0.01%.

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“…Two betavoltaic cells Labs were obtained from Air Force Research Laboratories (AFRL) and are being evaluated under temperature. results will provide a benchmark for the design, an understanding on how they operate, and a basis to determine if a correlation exists with solar activity [6].…”

Section: Simulation Of Electron Trajectories In Solids)mentioning

confidence: 99%

Development of Hydrogen Loading System and Characterization of Tritiated Metallic Films for Betavoltaic Batteries

Adams

Revankar

2014

Volume 5: Innovative Nuclear Power Plant Design and New Technology Application; Student Paper Competition

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Currently, no portable power source extends beyond 10 years in extreme temperature environments, e.g. -40°C to 80°C. Conventional electrochemical batteries do not perform well at extreme temperatures and rarely operate longer than 5 years; thermally induced performance degradation is common. However, commercial betavoltaic batteries can operate in excess of 10 years over extreme temperatures. Potential applications for low-power betavoltaic sources may be found in distributed power systems, sensors, remote power, and biomedical devices & implants. Betavoltaic technology is rapidly maturing, giving rise to numerous areas of research and development, e.g. beta source and semiconductor efficiency. This study presents an update on some current aspects of betavoltaics, challenges existing within the technology, and research and development currently being conducted. The substrate material that serves as the sync or storage medium for the radioisotope source has become a significant challenge due to issues associated with loading techniques, thin-film properties, beta-particle interaction, and defect damage. Recent betavoltaic designs invoking tritium stored as tritides in titanium and scandium demonstrated a number of practical difficulties yielding to material damage and inconsistent tritium concentrations. Various material modifications and hydrogen loading techniques are being evaluated to proof new methods, materials and designs that result in less expensive tritiated foils with consistent concentrations. Modeling experiments are being conducted to verify and validate the loading and storage mechanism of tritium in the metal hydrides.

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Additional experimental evidence for a solar influence on nuclear decay rates

Cited by 38 publications

References 44 publications

Disproof of solar influence on the decay rates of90Sr/90Y

Disproof of solar influence on the decay rates of90Sr/90Y

Precision long-term measurements of beta-decay-rate ratios in a controlled environment

Development of Hydrogen Loading System and Characterization of Tritiated Metallic Films for Betavoltaic Batteries

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