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Title: Analysis of beta-decay rates for Ag 108, Ba 133, Eu 152, Eu 154, Kr 85, Ra 226, and Sr 90, measured at the Physikalisch-Technische Bundesanstalt from 1990 to 1996

We present the results of an analysis of measurements of the beta-decay rates of Ag 108, Ba 133, Eu 152, Eu 154, Kr 85, Ra 226, and Sr 90 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 count rate measurements exhibit a sinusoidal annual variation with amplitude in the small range 0.068%-0.088% (mean 0.081%, standard deviation 0.0072%, a rejection of the zero-amplitude hypothesis) and phase-of-maximum in the small range 0.062-0.083 (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 do not appear to be compatible with an experimental or environmental influence. It is possible that Ba 133 measurements are also subject to a non-solar (possibly cosmic) influence.
Authors:
 [1] ;  [2] ;  [3]
  1. Center for Space Science and Astrophysics, Stanford University, Stanford, CA 94305 (United States)
  2. Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907 (United States)
  3. Department of Nuclear Engineering, Texas A and M University, College Station, TX 77843 (United States)
Publication Date:
OSTI Identifier:
22370142
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 794; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; ANNUAL VARIATIONS; ASTROPHYSICS; BARIUM 133; BETA DECAY; COMPARATIVE EVALUATIONS; COSMIC RADIATION; EUROPIUM 152; EUROPIUM 154; KRYPTON 85; NEUTRINOS; NONLUMINOUS MATTER; RADIUM 226; SILVER 108; STRONTIUM 90; SUN