R. N. Cahn and G. Goldhaber, The Experimental Foundations of Particle Physics, Cambridge Univ. Press (1991) 10.
The Physical Review - the First Hundred Years, AIP Press (1995) 610.
Out of the group of 1300 photographs of cosmic-ray tracks in a vertical Wilson chamber 15 tracks were of positive particles which could not have a mass as great as that of the proton. From an examination of the energy-loss and ionization produced it is concluded that the charge is less than twice, and is probably exactly equal to, that of the proton. If these particle carry unit positive charge the curvatures and ionizations produced require the mass to be less than twenty times the electron mass.
These particles will be called positrons. Because they occur in groups associated with other tracks it is concluded that they must be secondary particles ejected from atomic nuclei. Editor..
Related references More (earlier) information appears in C. D. Anderson, Science 76 (1932) 238;
See also C. D. Anderson, Phys. Rev. 43 (1933) 381A;
ex, mass, qn
Discovery of the positron, the first antiparticle, predicted by Dirac.