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By G. D. Rochester

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Produces, on average, a shower of ten particles in 3 cm. lead. Elastic collisions by fast particles (formation of "knock-on" electrons) Plate 53 Plate 54 Plate 55 45 SECTION III SLOW μ-MESONS AND THEIR DECAY 48 Early photographs of mesons Early photographs of mesons Plate 56. P . K U N Z E , Rostock, Z. Phys. 83, 1 (1933). This very early photograph shows a heavily ionizing track, almost certainly that of a positive meson, and a 37 MeV. electron. The author considers these particles to have arisen in a nuclear explosion.

Lead, and corresponds, on average, to a primary photon of energy about 700 MeV. The two electrons below the first lead plate are probably pair electrons from the absorption of the primary photon. Note the strong scattering of particles in the final thin sheet of lead. ). Plate 40. This photograph shows a remarkable cascade in which at one point no particles are present. Below the top lead plate, no cascade particles seem to be present, the stereoscopic pictures showing t h a t the two particles photographed are not directly connected with the electron primary.

C. STREET, J . Franklin Inst. 227, 765 (1939). The transition behaviour of a cascade from air a t a 1-3 cm. lead plate. The cloud chamber [STEVENSON and STREET, Phys. Rev. 48, 464 (1935)] was of wood with a gas-tight copper foil lining, and was 35 cm. square by 18 cm. deep, the illuminated depth being 8 cm. I t was used with argon and alcohol a t an expansion ratio of 1-09. The photograph shows photon-derived groups of 2, 2 and 5 particles and an electron-derived group of 9 particles. These correspond broadly to entrant energies of the order 100-400 MeV.

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