Abstract
ABSTRACT Samarium isotopes were fractionated in a liquid-liquid extraction system using dicychlohexano-18-crown-6. High precision isotope ratio measurements with a multicollector mass spectrometer made it possible to evaluate the contributions of the nuclear size and shape and the nuclear spin to the chemical isotope separation effect. The maximum value of the unit mass enrichment factor (ϵu was observed to be 0.00161 ± 0.00002. The odd/even enrichment factor of 147Sm was ϵO/E = −0.00101 ± 0.00062 and that of 149Sm was ϵO/E = −0.00049 ± 0.00050. Enrichment factors were affected by nuclear mass, nuclear volume and nuclear spin in addition to vibrational motion of molecule. The nuclear volume effect was 1.94 times as large as the nuclear mass effect. The odd/even atomic mass effect was explained with 6s2-6s6p transition in optical isotope shift of Sm I. The correction due to the nuclear spin of 147Sm was ϵspin; = −0.0016 and that of 149Sm was ϵspin; = −0.0014.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
