Abstract
Chromium isotopes were fractionated by the liquid-liquid extraction system using dicyclohexano-18-crown-6. We found a mass-independent isotope effect that the intermediate isotope of 5 2 Cr was enriched in the organic phase. Because of its magic number neutrons N = 28, 5 2 Cr has the smallest nuclear charge distribution in naturally occurring chromium isotopes. The enrichment property gives the confident experimental fact of the nuclear field shift effect in the new Bigeleisen theory.
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