The Electron-Electron System
According to our definition (cf. the introduction to Chapter 11) the electron-electron systems are specified by their initial states, in which there are either two negatons, two positons, or one negaton and one positon. The last case is of special interest, since it permits bound states; these states, however, are not stable. The bound structure which consists of one negaton and one positon is usually called positronium. We shall discuss it and its modes of decay in Sections 12-5 and 12-6 of this chapter. Sections 12-1 to 12-4 are devoted to scattering problems.
KeywordsPropa Azimuth Summing
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