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  • 1 Japan Atomic Energy Research Institute (JAERI) Department of Chemistry and Fuel Research Takasaki 370-12 Gunma Japan
  • | 2 JAERI Department of Chemistry and Fuel Research Tokai 319-11 Ibaraki Japan
  • | 3 Nagoya University Department of Energy Engineering Science Furo-cho, Chikusa-ku 464-01 Nagoya Japan
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Studies on the decay of unstable nuclei using the two on-line isotope separators of JAERI are reviewed for the past five years. With the previously established ion-source technique using mono-oxide ion formation in a thermal ion source, the new nuclides125Pr and127Pr have been identified in heavy-ion fusion residues. Further, with a newly developed gas-jet coupled thermal ion source, the new nuclides166Tb,165Gd,161Sm and236Am have been identified by bombarding238U and235U targets with a proton or6Li beam. Other studies, including off-line experiments, by decay spectroscopy, laser spectroscopy and Mössbauer spectroscopy are described.