Do radioactive half-lives vary with the Earth-to-Sun distance? Conference Paper uri icon


  • Recently, Jenkins, Fischbach and collaborators have claimed evidence that radionuclide half-lives vary systematically over a ±0.1% range as a function of the oscillating distance between the Earth and the Sun, based on multi-year activity measurements. We have avoided the time-dependent instabilities to which such measurements are susceptible by directly measuring the half-life of (198)Au (t(1/2)=2.695 d) on seven occasions spread out in time to cover the complete range of Earth-Sun distances. We observe no systematic oscillations in half-life and can set an upper limit on their amplitude of ±0.02%.

author list (cited authors)

  • Hardy, J. C., Goodwin, J. R., & Iacob, V. E.

citation count

  • 21

publication date

  • September 2012