# Direct test of the constancy of fundamental nuclear constants

@article{Shlyakhter1976DirectTO,
title={Direct test of the constancy of fundamental nuclear constants},
author={Alexander I. Shlyakhter},
journal={Nature},
year={1976},
volume={264},
pages={340-340}
}
THE possibility that fundamental nuclear constants may vary slowly while the Universe expands has been discussed by several authors1–5. I try here to show that the well known resonance properties of the ‘heavy nucleus plus slow neutron’ system make it a sensitive ‘receiver’, sharply tuned to the current values of nuclear constants.
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The Cosmological Constants
THE fundamental constants of physics, such as c the velocity of light, h Planck's constant, e the charge and m mass of the electron, and so on, provide for us a set of absolute units for measurement
Time Variation of the Charge of the Proton
From the terrestrial occurrence of the nuclei ${\mathrm{Re}}^{187}$ and ${\mathrm{Os}}^{187}$, it is deduced that the elementary unit of charge $e$ cannot have varied by as much as one part in 1600