Core emulsion

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A core emulsion plate is a photo plate with a particularly thick, sensitive layer and a very uniform grain size, which is used to detect and examine faster charged particles such as mesons . After irradiation and after development of the plate, the traces (blackened by silver) of the particles can be measured under the microscope.

In 1937 Marietta Blau and Herta Wambacher discovered with the help of such plates, which had been exposed to cosmic radiation at 2300 m above sea level , nuclear fragmentation stars (graphically in the layer) that had been created by spallation .

With the help of core emulsion plates, which he exposed on high mountains, Cecil Frank Powell and his colleagues discovered the pion in 1947 .

literature

  • H. Franke: Lexicon of Physics. Franckh'sche Verlagshandlung Stuttgart (1969)
  • Robert Rosner, Brigitte Strohmaier (Ed.): Marietta Blau, Stars of Destruction. Biography of a pioneer of modern particle physics . Böhlau-Verlag, Vienna 2003, ISBN 3205-77088-9 (contributions to the history of science and science research; 3)

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