Antimatter was first predicted by British physicist Paul Dirac in 1928 and then experimentally discovered in 1932 by American physicist Carl D. Anderson, who observed the positron (the antiparticle of the electron) in cosmic rays.

Quick Scoop

  • The idea of antimatter in modern physics starts with Paul Dirac’s relativistic equation for the electron, which implied the existence of a particle like the electron but with positive charge.
  • In 1932, Carl Anderson confirmed this prediction when he detected the positron in a cloud chamber while studying cosmic rays, effectively becoming the person who “discovered antimatter” in the lab.
  • Earlier, in 1898, Arthur Schuster had speculated about “antimatter” and “antiatoms” in letters to Nature , but his usage was more playful and not a serious physical theory like Dirac’s.

Who “gets credit” for antimatter?

To answer “who discovered antimatter,” physicists usually split the credit:

  1. Theoretical prediction
    • Paul Dirac showed that combining quantum mechanics with special relativity leads naturally to antiparticles, opening the “case file” for antimatter in 1928.
 * His equation had both positive- and negative-energy solutions, which could be interpreted as electrons and “antielectrons” (later called positrons).
  1. Experimental discovery
    • Carl D. Anderson actually saw the first antimatter particle in 1932—tracks in a cloud chamber that revealed a particle with the same mass as an electron but positive charge.
 * That particle was the positron, the first confirmed antiparticle, and Anderson received the Nobel Prize in Physics in 1936 for this discovery.

So, in short:

  • The theoretical discoverer of antimatter: Paul Dirac.
  • The experimental discoverer of antimatter (via the positron): Carl D. Anderson.

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