Hideo Kanazawa

On the Plasma Oscillations in Metal Foils

The dispersion relations, lifetimes of plasmons in metal foils, and the probability of plasmon excitation by incident electrons are derived quantum mechanically. The results obtained are the generalizations of Ferrells semi- classical theory. (auth)

Green Function Method in Quantum-Statistics

An extension is presented of the slightly refined Matsubara method for the computation of the grand partition function for quantum statistical averages. This computation is extended for the case of the electron gas, from which the results of Montroll and Ward are obtained. A slight

On the Positronium in Metals

Experimental results indicate that in metals positrons reach thermal velocity in a short time and subsequently remain free, annihilating with conduction electrons. However, the possibility of the existence of positronium in metals undergoing continuous change of the electron partner may not be excluded. An electron-positron system in metals is considered, and its properties are investigated. The properties are somewhat different from those in free space. The binding energy and lifetimes ware computed and tabulated for several alkali metals. The binding energies of positronium in alkali metals are smaller than that of positronium in free space and the lifetimes are longer, except in lithium. (A.C.)