Analysis of Beta-Decay Rates for Ag108, Ba133, Eu152, Eu154, Kr85, Ra226 And Sr90, Measured at the Physikalisch-Technische Bundesanstalt from 1990 to 1996

Abstract

We present the results of an analysis of measurements of the beta-decay rates of Ag108, Ba133, Eu152, Eu154, Kr85, Ra226, and Sr90 acquired at the Physikalisch-Technische Bundesanstalt from 1990 through 1995. Although the decay rates vary over a range of 165 to 1 and the measured detector current varies over a range of 19 to 1, the detrended and normalized current measurements exhibit a sinusoidal annual variation with amplitude in the small range 0.068% to 0.088% (mean 0.081%, standard deviation 0.0072%, an 11σ rejection of the zero-amplitude hypothesis) and phase-of-maximum in the small range 0.062 to 0.083 (January 23 to January 30). In comparing these results with those of other related experiments that yield different results, it may be significant that this experiment, at a standards laboratory, seems to be unique in using a 4π detector. These results are compatible with a solar influence, and appear not to be compatible with an experimental or environmental influence. It is possible that Ba133 measurements are subject also to a non-solar (possibly cosmic) influence.

arXiv comment10 pages, 10 figures

References in corpus (9)

• Evidence for Correlations Between Nuclear Decay Rates and Earth-Sun Distance
• Perturbation of Nuclear Decay Rates During the Solar Flare of 13 December 2006
• Neutrino Clouds
• Analysis of Gamma Radiation from a Radon Source: Indications of a Solar Influence
• Analysis of environmental influences in nuclear half-life measurements exhibiting time-dependent decay rates
• An Analysis of Apparent r-Mode Oscillations in Solar Activity, the Solar Diameter, the Solar Neutrino Flux, and Nuclear Decay Rates, with Implications Concerning the Solar Internal Structure and Rotation, and Neutrino Processes
• Power Spectrum Analysis of LMSU (Lomonosov Moscow State University) Nuclear Decay-Rate Data: Further Indication of r-Mode Oscillations in an Inner Solar Tachocline
• Concerning the Phases of Annual Variations of Nuclear Decay Rates
• Addendum to "On an unverified nuclear decay and its role in the DAMA experiment''

Cited by in corpus (5)

• Precise measurement of the 222Rn half-life: a probe to monitor the stability of radioactivity
• Precision long-term measurements of beta-decay-rate ratios in a controlled environment
• Results of a search for daily and annual variations of the Po-214 half-life at the two year observation period
• Search for Possible Solar Influences in Ra-226 Decays
• Sensitivity of reactor experiments to nonstandard neutrino interactions in beta decay rates