[en] Neutronic calculations were made to examine the conceptual feasibility of the small molten-salt reactor, FUJI-Pu, for effective plutonium diminution and effective ²³³U production to use thorium as energy resource. Though the reactor in this report has almost the same features of the one reported previously, the authors intended to consume more Pu and to produce more ²³³U by changing the reactor operation mode, i.e. yearly isolation of uranium isotopes by applying fluorination and evaporation method. Burn-up characteristics were calculated form 900 days operation at rated power by using ORIGEN-2. The results show that the reactor can transmute 980kg of plutonium isotopes and produce 489kg of ²³³U annually for 1GE_e of the electricity generation. Hence, the reactor could be an efficient Pu burner and an efficient ²³³U producer, comparing with LWRs operated with MOX fuel. (author). 12 refs, 9 figs, 5 tabs

[en] Full text: Studies on the photochemical dynamics of inner-shell excited molecules have been stimulated by the recent advancement of synchrotron radiation technology. Inner-shell excited molecule in a specific vibrational level is produced by means of synchrotron radiation. The yields of fragment ions depend on the vibrational level of the excited molecule. In the present work we studied the kinetic energy distributions of the fragment ions of CF₂CH₂ by exciting the C-H stretching mode in the C K-edge region. The experiments were performed on the beamline BL27SU at the SPring-8 facility. Photoabsorption cross-sections were measured with a resolving power of 9500. Time-of-flight mass spectra were acquired at several photon energies across the two π* peaks. Kinetic energies of the CH₂⁺ and CF₂⁺ fragment ions were deduced by a peak fitting method. Asymmetric peaks observed in 285-286 and 289-290 eV were assigned to the promotion to the π* orbital from the C_H 1s and C_F 1s electrons, respectively. These transitions were accompanied by the C-H stretching progressions. Relative yield of the CH₂⁺ ion with kinetic energy centered near 4 eV increased with the vibrational excitation in the case of the C_F 1s excitation

[en] Full text: Total photoabsorption cross sections of CF₃SF₅, which is a new and potent green- house gas, were measured in the C, F and S K-shell regions. The spectra in the C and F K-edges are the first experimental data. The tentative peak assignments of the K-shell excited CF₃SF₅ were proposed on the basis of comparison with those of CF₄ and SF₆ measured. Site-selective photofragmentation was studied by selectively exciting the K- shell electrons of the C, F and S atoms and the S2p electron. When we excited the C1s and F1s electrons of the CF₃ group, the yields of SF₅⁺ and SF₃⁺ fragment ions were relatively large, and when the F1s electron of SF₅ was excited the relative yield of CF₃⁺ was high. The S1s electron excitation gave a completely different fragmentation pattern, in which the Sⁱs prominent with considerable yields of the multiply charged S²⁺ and S³⁺. The yields of CF₃⁺ and SF₅⁺ were negligible. The S2p excitation gave the similar fragmentation pattern with that of the C1s excitation. That is, hole-dependent fragmentation was strongly observed

[en] Photoabsorption cross-sections of CF₂CH₂ were measured in the carbon K-edge region and linear time-of-flight mass spectra were acquired at some photon energies across the two π * peaks. The kinetic energy distributions of CH₂⁺ and CF₂⁺ with two components were deduced from the analysis of the mass spectra. The CH₂⁺ ion with high kinetic energies increases with the extent of vibrational excitation of the C_F 1s → π * state, indicating that molecular vibrations play an important role in the photofragmentation of the inner-shell excited molecule