J
J. T. Gruenwald
Researcher at Purdue University
Publications - 24
Citations - 527
J. T. Gruenwald is an academic researcher from Purdue University. The author has contributed to research in topics: Radioactive decay & Neutrino. The author has an hindex of 8, co-authored 22 publications receiving 501 citations.
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Journal ArticleDOI
Evidence of correlations between nuclear decay rates and Earth–Sun distance
Jere H. Jenkins,Ephraim Fischbach,J. B. Buncher,J. T. Gruenwald,Dennis E. Krause,Dennis E. Krause,J. J. Mattes +6 more
TL;DR: In this paper, the decay rates of 32 Si and 226 Ra have been investigated at Brookhaven National Laboratory (32 Si) and at the Physikalisch-Technische-Bundesanstalt in Germany (226 Ra).
Journal ArticleDOI
Time-Dependent Nuclear Decay Parameters: New Evidence for New Forces?
Ephraim Fischbach,J. B. Buncher,J. T. Gruenwald,Jere H. Jenkins,Dennis E. Krause,J. J. Mattes,J. R. Newport +6 more
TL;DR: The question of whether nuclear decay rates (or half-lives) are time-independent constants of nature, as opposed to being parameters which can be altered by an external perturbation has been discussed in this paper.
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Power spectrum analyses of nuclear decay rates
D. Javorsek,Peter A. Sturrock,R. N. Lasenby,A. N. Lasenby,J. B. Buncher,Ephraim Fischbach,J. T. Gruenwald,A. W. Hoft,T. J. Horan,Jere H. Jenkins,J. L. Kerford,R. H. Lee,A. Longman,J. J. Mattes,B. L. Morreale,D. B. Morris,R. Mudry,J. R. Newport,D. O’Keefe,M. A. Petrelli,M. A. Silver,C. A. Stewart,B. Terry +22 more
TL;DR: In this article, a spectral analysis of nuclear decay data displaying annually varying periodic fluctuations is presented. But, the spectral properties of the decay data were not analyzed and no common phases were found between the factors investigated and those exhibited by the nuclear decay.
Journal ArticleDOI
Power spectrum analysis of BNL decay rate data
Peter A. Sturrock,J. B. Buncher,Ephraim Fischbach,J. T. Gruenwald,D. Javorsek,Jere H. Jenkins,R. H. Lee,J. J. Mattes,J. R. Newport +8 more
TL;DR: In this paper, the running-mean of the power spectrum was investigated, and a major peak at 11.18 year−1 with power 4.08 was identified, and the significance of this peak in terms of the false-alarm probability was evaluated by means of the shuffle test and also by a new test (the "shake" test) that involves small random time displacements.
Journal ArticleDOI
Power Spectrum Analysis of Physikalisch-Technische Bundesanstalt Decay-Rate Data: Evidence for Solar Rotational Modulation
Peter A. Sturrock,J. B. Buncher,Ephraim Fischbach,J. T. Gruenwald,D. Javorsek,Jere H. Jenkins,R. H. Lee,J. J. Mattes,J. R. Newport +8 more
TL;DR: In this paper, the decay rates of Ra-226 acquired at the Physikalisch-Technische Bundesanstalt (PTB) in Germany were analyzed and a significant peak was found at frequency 11.23/yr.