Nuclear Field Shift Effect in the Isotope Exchange Reaction of Chromium(III) Using a Crown Ether

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 52 Cr was enriched in the organic phase. Because of its magic number neutrons N = 28, 52 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.