Separation of samarium isotopes by a crown ether
- Osaka Univ., Suita, Osaka (Japan). Dept. of Nuclear Engineering
- Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Analytical Chemistry Lab.
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 ({var_epsilon}{sub u}) was observed to be 0.00161 {+-} 0.00002. The odd/even enrichment factor of {sup 147}Sm was {var_epsilon}{sub O/E} = {minus} 0.00101 {+-} 0.00062 and that of {sup 149}Sm was {var_epsilon}{sub O/E} = {minus}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 6s{sup 2}-6s6p transition in optical isotope shift of Sm I. The correction due to the nuclear spin of {sup 147}Sm was {var_epsilon}{sub spin} = {minus}0.0016 and that of {sup 149}Sm was {var_epsilon}{sub spin} = {minus}0.0014.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 346967
- Journal Information:
- Solvent Extraction and Ion Exchange, Journal Name: Solvent Extraction and Ion Exchange Journal Issue: 4 Vol. 16; ISSN 0736-6299; ISSN SEIEDB
- Country of Publication:
- United States
- Language:
- English
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