C. POWELL, P. FOWLER & D. PERKINS / SCIENCE PHOTO LIBRARY C. POWELL, P. FOWLER & D. PERKINS / SCIENCE PHOTO LIBRARY
Emulsion photograph showing the birth and death of a cosmic ray pion (or pi-meson). A primary cosmic ray has struck and shattered an atomic nucleus to form the "star" at the bottom of the picture. Among the fragments of the collision, a pion has been created which forms the track moving towards the top right. The pion soon strikes another nucleus, forming a second "star". The length of the pion's track is about 0.11 mm. The picture, taken in 1947 by Lattes, Occhialini & Powell, was one of the first observations of the creation of a pion.
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