Pressure Dependence of the Radioactive Decay Constant of Beryllium-7

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Science  21 Sep 1973:
Vol. 181, Issue 4105, pp. 1164-1165
DOI: 10.1126/science.181.4105.1164


Diamond anvil presses of a new design were used to compress samples of beryllium-7 oxide to 120, 210, and 270 kilobars. The decay constant for the conversion of beryllium-7 to lithium-7 by electron capture was measured for compressed and uncompressed samples. A least-squares fit of the equation (λc-λ)/λ = KpP to the experimental data, where λC and λ are the decay constants of the compressed sample and an uncompressed sample, respectively, and P is pressure, yields a value of (2.2 ± 0.1) x 10-5 kbar-1 for the constant Kp.