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Searching for modifications to the exponential radioactive decay law with the Cassini spacecraft  [PDF]
Peter S. Cooper
Physics , 2008, DOI: 10.1016/j.astropartphys.2009.02.005
Abstract: Data from the power output of the radioisotope thermoelectric generators aboard the Cassini spacecraft are used to test the conjecture that small deviations observed in terrestrial measurements of the exponential radioactive decay law are correlated with the Earth-Sun distance. No significant deviations from exponential decay are observed over a range of 0.7 - 1.6 A.U. A 90% Cl upper limit of 0.84 x 10^-4 is set on a term in the decay rate of Pu-238 proportional to 1/R^2 and 0.99 x 10^-4 for a term proportional to 1/R.
Power-law tails in triple system decay statistics  [PDF]
A. V. Bogomolov,S. A. Pavluchenko,A. V. Toporensky
Physics , 2011,
Abstract: We have investigated the decay statistics of triple systems with different masses in Newtonial dynamics. We demonstrate that in a broad interval of mass ratios this statistics has good approximation by power-law tails. The power indices do not show any significant dependence on mass ratios.
Level Statistics of Stable and Radioactive Nuclei  [PDF]
M. A. Jafarizadeh,N. Fouladi,H. Sabri,B. Rashidian Maleki
Physics , 2012,
Abstract: The spectral statistics of nuclei undergo through the major forms of radioactive decays ((\alpha)(\beta^-), and(\beta^+) (or EC)) and also stable nuclei are investigated. With employing the MLE technique in the nearest neighbor spacing framework, the chaoticity parameters are estimated for sequences prepared by all the available empirical data. The ML-based estimated values propose a deviation to more regular dynamics in sequences constructed by stable nuclei in compare to unstable ones. In the same mass regions, nuclei transmitted through (\alpha)decay explore less regularity in their spectra in compare to other radioactive nuclei.
Deterministic Chaos in Radioactive Decay  [PDF]
Július Krempasky,?tefan Hú??ava,Pavol Valko
Physics , 2013,
Abstract: We examine the radioactive decay of iodine in terms of its Kolmogorov entropy, observing a consistency with the presence of a regime of deterministic chaos in the vacuum dynamics.
Small Violations of Statistics  [PDF]
O. W. Greenberg
Physics , 1999,
Abstract: There are two motivations to consider statistics that are neither Bose nor Fermi: (1) to extend the framework of quantum theory and of quantum field theory, and (2) to provide a quantitative measure of possible violations of statistics. After reviewing tests of statistics for various particles, and types of statistics that are neither Bose nor Fermi, I discuss quons, particles characterized by the parameter $q$, which permit a smooth interpolation between Bose and Fermi statistics; $q=1$ gives bosons, $q=-1$ gives fermions. The new result of this talk is work by Robert C. Hilborn and myself that gives a heuristic argument for an extension of conservation of statistics to quons with trilinear couplings of the form $\bar{f}fb$, where $f$ is fermion-like and $b$ is boson-like. We showed that $q_f^2=q_b$. In particular, we related the bound on $q_{\gamma}$ for photons to the bound on $q_e$ for electrons, allowing the very precise bound for electrons to be carried over to photons. An extension of our argument suggests that all particles are fermions or bosons to high precision.
Relativity violations and beta decay  [PDF]
Jorge S. Diaz,Alan Kostelecky,Ralf Lehnert
Physics , 2013, DOI: 10.1103/PhysRevD.88.071902
Abstract: In some quantum theories of gravity, deviations from the laws of relativity could be comparatively large while escaping detection to date. In the neutrino sector, precision experiments with beta decay yield new and improved constraints on these countershaded relativity violations. Existing data are used to extract bounds of $3 \times 10^{-8}$ GeV on the magnitudes of two of the four possible coefficients, and estimates are provided of future attainable sensitivities in a variety of experiments.
Is Radioactive Decay Really Exponential?  [PDF]
Philip J. Aston
Physics , 2012, DOI: 10.1209/0295-5075/97/52001
Abstract: Radioactive decay of an unstable isotope is widely believed to be exponential. This view is supported by experiments on rapidly decaying isotopes but is more difficult to verify for slowly decaying isotopes. The decay of 14C can be calibrated over a period of 12,550 years by comparing radiocarbon dates with dates obtained from dendrochronology. It is well known that this approach shows that radiocarbon dates of over 3,000 years are in error, which is generally attributed to past variation in atmospheric levels of 14C. We note that predicted atmospheric variation (assuming exponential decay) does not agree with results from modelling, and that theoretical quantum mechanics does not predict exact exponential decay. We give mathematical arguments that non-exponential decay should be expected for slowly decaying isotopes and explore the consequences of non-exponential decay. We propose an experimental test of this prediction of non-exponential decay for 14C. If confirmed, a foundation stone of current dating methods will have been removed, requiring a radical reappraisal both of radioisotope dating methods and of currently predicted dates obtained using these methods.
Comments on Violations of the Second Law  [PDF]
Elias P. Gyftopoulos
Physics , 2007,
Abstract: The authors of Ref. [1] claim to have experimental verification of violations of the second law of thermodynamics based on the assertions: (i) "for large systems and over long times the entropy production rate is necessarily positive"; (ii) Loschmidt's paradox interpreted as indicating that entropy production can be both positive and negative; (iii) and violations of the second law for small systems over short time scales predicted by the fluctuation theorem FT [2]. Neither the claim nor the assertions are correct.
Does the radioactive decay obey the Poisson statistics?  [PDF]
A. A. Kirillov
Physics , 2000,
Abstract: It is shown that a nontrivial quantum structure of our space at macroscopic scales, which may exist as a relic of quantum gravity processes in the early universe, gives rise to a new phenomenon: spontaneous origin of an interference picture in every physical process. This explains why statistical distributions in radioactivity measurements may be different from the Poisson distribution.
An Operator Equation and Relativistic Alterations in the Time for Radioactive Decay  [PDF]
Robert A. Herrmann
Physics , 2003,
Abstract: In this paper, using concepts from the nonstandard physical world, the linear effect line element is derived. Previously this line element was employed to obtain, with the exception of radioactive decay, all of the experimentally verified special theory relativistic alterations in physical measures. In this paper by means of an operator equation and separation of variables, the relativistic alteration in decay time for radioactive material is obtained by applying a hypercontinuous microeffect that gives the appearance of a discrete alteration in the amount of radioactive material present.
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