Electron (1897): J.J. Thomson, through his cathode ray experiments, discovered the electron and proposed the "plum pudding" model of the atom, where electrons were embedded in a uniform distribution of positive charge.
Proton (1919): Ernest Rutherford, through his gold foil experiment, demonstrated the existence of a small, dense, positively charged nucleus within the atom. The proton was indirectly detected as a positively charged particle during this experiment.
Neutron (1932): James Chadwick confirmed the existence of the neutron, a neutral particle present in the nucleus alongside protons. His experiments involved bombarding beryllium with alpha particles and observing the emission of neutral radiation.
Positron (1932): Carl Anderson discovered the positron, a positively charged electron, while studying cosmic rays. He observed the creation of electron-positron pairs in interactions between high-energy photons and matter.
Antiproton (1955): Emilio Segrè and Owen Chamberlain produced the first antiproton artificially at the University of California, Berkeley. They accomplished this by colliding high-energy protons with a target, resulting in the creation of an antiproton-proton pair.
Neutrino (1956): Frederick Reines and Clyde Cowan detected the neutrino, a chargeless and nearly massless particle emitted during certain radioactive decays. They conducted an experiment involving the inverse beta decay reaction to confirm the existence of the neutrino.
Quarks (1964): Murray Gell-Mann and George Zweig independently proposed the quark model, suggesting that protons and neutrons are composed of even smaller particles called quarks. This theory led to the development of quantum chromodynamics (QCD) and the classification of subatomic particles into families.
These discoveries have revolutionized our understanding of the fundamental building blocks of matter and have greatly contributed to the field of particle physics.
