| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2003: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2001: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Research Abstract |
The chemical properties of transactinide elements were investigated by use of a gas-phase reaction. The isotopes of Zr,Hf and Rf were produced simultaneously and their chemical properties were examined simultaneously. We could observe the α-spectrum of Rf which was chemically separated by an isothermal gas-chromatograph and it was ascertained that a volatile Rf chloride was formed under the same experimental conditions with those for Zr and Hf. The dependence of the relative yield on the temperature of the isothermal column was examined. The result shows that the chromatographic behaviors of Zr,Hf and Rf are quite similar with each other. As Zr and Hf show quite similar properties in macro amount scale and the present result is consistent with this feet, it was concluded that Rf chloride behaves similarly with Zr and Hf chlorides. The simple extrapolation from the periodic table expects that Rf chloride would evaporate at higher temperature than that for Zr and Hf chlorides. On the other hand, relativistic calculations suggest about the same volatility for these three chlorides. Present result is consistent with the expectation from the relativistic calculations.
The gas phase reaction with fission products from spontaneous fission of ^<252>Cf and dipivaloylmethane(dpm) which forms β-diketonates was examined. The result shows that among the fission products which were transported by KC1 aerosol load helium gas, only Ru and Rh selectively form volatile dpm complexes. As Hs(Z=108) and Mt(Z=109) are expected to have similar properties with those of lighter homoldgues, Ru and Rh, respectively, isothermal chromatographic behaviors of the volatile compounds of Ru and Rh were examined in detail. It was found that the reaction yields of the volatile compounds were about 45% and the volatility of these compounds is high. Furthermore, this method can be applied to short-lived nuclei, because ^<109>Ru (T_<1/2>=34.5s) was chemically separated and observed.
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