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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Powell, Fowler & Perkins |
Taille de l’image : | 2480 px × 3901 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |