Next couple of years the positron was only a theory. Nobody observed them and even having some proves of its subsistence nobody managed to interpret them correctly. As far as in 1932 Carl Anderson found some tracks of positrons moving through a fog track chamber an interpreted the occurrence correctly. Both with Millikan they conducted some experiments researching cosmic radiation. They placed a fog track chamber in the strong magnetic field. The particles of the cosmic radiation moving through it were aberrated in this field. This gave the possibility of the determination of their molecular composition (the trajectory of the particle in the magnetic field depend on it's mass and charge - protons and electrons have got other trajectories). Positive particles deviate to the one side in magnetic field, and negative particles to the opposite side.
Scientists made some photographs of particles trajectories. On some of this photographs Anderson discovered strange trajectories. Those were electron's trajectories but they were deviate in the wrong direction. What could that meant? This cannot be protons or alpha particles, because they have got bigger mass than electrons, and their trajectories in magnetic field are different. From the same reason this cannot be also any others well-known particles. It had to be positrons.
Anderson interpreted this phenomenon exactly in this way. For this discovery in 1936 he was awarded a Nobel Prize.
The first antiparticle was discovered.
SUBSEQUENT RESEARCH OF ELECTRON | ATTEMPTS OF ELEMENTARY CHARGE EVALUATION | DISCOVERY AND RESEARCH OF X RAYS | RADIOACTIVITY | KELVIN'S-THOMSON'S ATOMIC MODEL | QUANTYM THEORY - THE NEW GREAT IDEA | BOHR'S ATOMIC STRUCTURE MODEL | IMPROVED BOHR'S THEORY | ELECTON BEING A WAVE | PARTICLE ACCELERATORS | CHERNOBYL | CHERNOBYL TOWARDS POLAND | NUCLEAR PLANTS AND ENVIRONMENT | PROPABILITY WAVE AND INDETERMINACY PRINCIPLE | ATOMIC NUCLEUS | MORE ABOUT QUANTUM NUMBERS | NEUTRINOS | NEUTRONS | POSITRONS | NUCLEAR REACTIONS | NUCLEAR REACTOR | FURTHER RESEARCH OF RADIOACTIVITY | DETAILED RELATIVITY THEORY | TOKAMAK | FISSON AND NUCLEAR SYNTESIS | ATOMIC BOMB