Results 1 - 10 of 997
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[en] Resonance integrals and fission-spectrum averaged cross-sections are calculated for the actinides of ENDF/B-V, INDL/A-83 and JENDL-2. The results are compared with each other and with experimental data when available. The experimental data are scarce and these exists large differences among data from different libraries. (author)
[pt]Neste trabalho, sao calculados integrais de ressonancia, e secoes de choque medias de espectros de fissao para os actinideos de ENDF/B-V, INDL/A - 83 e JENDL-2. Os resultados sao comparados entre eles e com dados experimentais disponiveis. Os dados experimentais sao escassos e ha uma grande discrepancia entre os dados obtidos de diferentes bibliotecas
[en] The effect of hybridization of electron states on the high-frequency conductivity of disordered semiconductors is studied. It is shown that the dependence of the pre-exponential factor of the resonance integral on the intercenter separation in a pair determines the abruptness of the change in conductivity mechanisms near the transition of the frequency dependence of the real part of the conductivity σ1(ω) from sublinear to quadratic. The abruptness of the change of the conductivity regimes is associated with a rapid decrease in hopping distance with increasing frequency near the transition, which leads to a substantial relative decrease in the contribution from the phononless conductivity component in the variable-range hopping regime with increasing frequency and transition to the fixed-range hopping conductivity regime.
[en] Full text: (author)It is shown that quantum optical systems preserving the total number of excitations admit a simple classification of possible resonant transitions (including effective), which can be classified by analyzing the free Hamiltonian and the corresponding integrals of motion. Quantum systems not preserving the total number of excitations do not admit such a simple classification, so that an explicit form of the effective Hamiltonian is needed to specify the allowed resonances. The structure of the resonant transitions essentially depends on the algebraic properties of interacting subsystems
[en] For a mixture of two families of resonances, we found the probability distribution for the distance, as first neighbors, between resonances that belong to different families. Integration of this distribution gives the probability of accidental overlapping of resonances of one isotope by resonances of the other, provided that the resonances of each isotope belong to a single family. (author)