Beschreibung
First edition, very rare separately-paginated offprint (journal pagination 1229-1232), of Curie and Joliot's 'missed' discovery of the positron. The Joliot-Curies work on the positron began in April 1932, four months before Carl D. Anderson s discovery, when they bombarded beryllium with polonium alpha-particles and sent the neutrons that were produced through paraffin and other hydrogenous substances, detecting the recoil protons in their ionization chamber and photographing their tracks after entering Joliot's cloud chamber when immersed in a 1500-gauss magnetic field. They also photographed the tracks of electrons that were expelled from a lead filter, one of which, they found, was 'curved in an opposite sense to the others' [the offered paper, p. 2]. They realized they had photographed the track of a positron only after learning of its discovery [Anderson, The apparent existence of easily detectable positives, Science 76 (1932), 238-239], either from Patrick M.S. Blackett and Giuseppe P.S. Occhialini's paper in the Proceedings of the Royal Society [Some photographs of the tracks of penetrating radiation, PRS 139A, 699-727], where they identified it with Paul A. M. Dirac's anti-electron, or from Chadwick, Blackett, and Occhialini's note in the April 1, 1933, issue of Nature [New evidence for the positive electron, Nature 131, 473]. They then realized that they had missed a major discovery" (Guerra, Leone & Robotti, The discovery of artificial radioactivity, Physics in Perspective 14 (2012), pp. 33-58). 8vo, pp. [1], 2-3, [1, blank. Original printed wrappers. Bestandsnummer des Verkäufers ABE-1677951617895
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