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LANDAU, Lev and E.M. Lifshitz, "Production of Electrons and Positrons by a Collision of Two Particles", in Physikalische Zeitschrift der Sowjetunion, 1934. Technischer Staatsverlag, volume 6 no. 3, pp 244-257 in the issue of pp 193-326 . Original wrappers. Very nice copy, with a restored and rebacked spine, beautifully crafted, and nearly invisible repair. Provenance: Bibliothek der Physikalische Geselschft in der Deutschen Dem. Republik, with one rubber stamp on the front cover. Newly housed in a folding document case, half-calf over cloth boards. "The first published calculations of the rate of e+ e− pair production in photon-photon collisions were done by Lev Landau in 1934 [the paper offered here]. It was predicted that the process of e+ e− pair creation (via collisions of photons) dominates in collision of ultra-relativistic charged particles because those photons are radiated in narrow cones along the direction of motion of the original particle, greatly increasing photon flux. In high-energy particle colliders, matter creation events have yielded a wide variety of exotic heavy particles precipitating out of colliding photon jets (see two-photon physics). Currently, two-photon physics studies creation of various fermion pairs both theoretically and experimentally (using particle accelerators, air showers, radioactive isotopes, etc.)"--"Matter Creation" in Wikipedia. [++] "In this issue, Soviet physicist Lev Davidovich Landau (1908-1968) and his graduate student Evgeny Mikhailovich Lifshitz (1915-1985) published calculations of electron pair production in photon-photon collisions, the first analysis of how matter is created from energy in the early universe. [++] Also in 1934, Soviet physicist Lev Davidovich Landau (1908-1968) and his graduate student Evgeny Mikhailovich Lifshitz (1915-1985) published calculations of electron pair production in photon photon collisions, the first analysis of how matter is created from energy in the early universe."--History of Physics, the Wenner Collection (Big Bang Theory and the Origin of the Universe; Big Bang Nucleosynthesis and the CMB.
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