  [NOTE: This 1983 preprint is being uploaded to arXiv.org after the death of
its author, who supported online distribution of his work. Contact info of the
submitter is at http://ilya.cc .]
  The positions of neutron resonances have been shown to be highly sensitive to
the variation of fundamental nuclear constants. The analysis of the measured
isotopic shifts in the natural fossil reactor at Oklo gives the following
restrictions on the possible rates of the interaction constants variation:
strong ~2x10^-19 yr^-1, electromagnetic ~5x10^-18 yr^-1, weak ~10^-12 yr^-1.
These limits permit to exclude all the versions of nuclear constants
contemporary variation discussed in the literature. URL: http://alexonline.info
>. For more recent analyses see hep-ph/9606486, hep-ph/0205206 and
astro-ph/0204069 .
