M.G. Lattes, G. P. S. Occhailini, and C. F. Powell , “Observations on the tracks of slow mesons in photographic emulsions”, in Nature, 160 No. 4066 pp. 453–456, October 4, 1947, with photos, tables, and graphs. Original wrappers. Almost invisible professional repair to front wrapper, otherwise fine. Confirmation of the discovery of the Pion. $250
"1947 was the year of the pion...In February of that year, Cecil Powell and Giuseppe Occhialini reported[on Nature 159, 186–190] the observation of six star-like patterns in emulsions exposed to cosmic rays. Powell's group had finally found the Yukawa particle, predicted in 1935 to be the carrier of strong force inside the atomic nucleus. In fact, Don Perkins pipped them to the post with the publication of a single, similar star-like event just two weeks earlier. Later in the year, another paper from Powell's group [the paper offered here] announced the first observation of pion decay to a muon — the particle picture was beginning to take shape."–From NATURE'S “Physics Portal” on the discovery of the pion.
From the paper: “In recent experiments, it has been shown that charged mesons, brought to rest in photographic emulsions, sometimes lead to the production of secondary mesons. We have now extended these observations by examining plates exposed in the Bolivian Andes at a height of 5,500 m., and have found, in all, forty examples of the process leading to the production of secondary mesons...”
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