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Spectral content of 22Na/44Ti decay data: implications for a solar influence

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Abstract

We report a reanalysis of data on the measured decay rate ratio 22Na/44Ti which were originally published by Norman et al., and interpreted as supporting the conventional hypothesis that nuclear decay rates are constant and not affected by outside influences. We find upon a more detailed analysis of both the amplitude and the phase of the Norman data that they actually favor the presence of an annual variation in 22Na/44Ti, albeit weakly. Moreover, this conclusion holds for a broad range of parameters describing the amplitude and phase of an annual sinusoidal variation in these data. The results from this and related analyses underscore the growing importance of phase considerations in understanding the possible influence of the Sun on nuclear decays. Our conclusions with respect to the phase of the Norman data are consistent with independent analyses of solar neutrino data obtained at Super-Kamiokande-I and the Sudbury Neutrino Observatory (SNO).

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Acknowledgements

We are indebted to E.B. Norman and his collaborators for generously sharing with us the data analyzed in this article. The work of P.A.S. was supported in part by the NSF through Grant AST-06072572, and that of E.F. was supported in part by U.S. DOE Contract No. DE-AC02-76ER07128. The views expressed in this paper are those of the authors and do not reflect the official policy or position of the U.S. Air Force, U.S. Department of Defense, or the U.S. Government. The material in this paper is Unclassified and approved for public release. Distribution is unlimited, reference Air Force Flight Test Center Public Affairs.

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Authors and Affiliations

  1. Physics Department, U.S. Air Force Academy, USAFA, 2354 Fairchild Dr., Colorado Springs, CO, 80840, USA

    D. O’Keefe, B. L. Morreale & R. H. Lee

  2. Physics Department Wittenberg University, Springfield, OH, 45501, USA

    John B. Buncher

  3. School of Nuclear Engineering, Purdue University, 400 Central Dr., West Lafayette, IN, 47907, USA

    J. H. Jenkins

  4. Department of Physics, Purdue University, West Lafayette, IN, 47907, USA

    J. H. Jenkins, Ephraim Fischbach & T. Gruenwald

  5. 412th Test Wing, Edwards AFB, CA, 93524, USA

    D. Javorsek II

  6. Center for Space Science and Astrophysics, Stanford University, Stanford, CA, 94305, USA

    P. A. Sturrock

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  1. D. O’Keefe
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  2. B. L. Morreale
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  3. R. H. Lee
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  4. John B. Buncher
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  9. P. A. Sturrock
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Correspondence to J. H. Jenkins.

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O’Keefe, D., Morreale, B.L., Lee, R.H. et al. Spectral content of 22Na/44Ti decay data: implications for a solar influence. Astrophys Space Sci 344, 297–303 (2013). https://doi.org/10.1007/s10509-012-1336-7

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  • DOI: https://doi.org/10.1007/s10509-012-1336-7

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