Title: Direct Test of the Time-Independence of Fundamental Nuclear Constants Using the Oklo Natural Reactor

Abstract: [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 this http URL .]
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: this http URL >. For more recent analyses see hep-ph/9606486, hep-ph/0205206 and astro-ph/0204069 .