50-years-ago,-researchers-were-on-a-mission-for-quarks
cover of the February 13, 1971 issue

More about partons Science News, February 13, 1971

Experiments in which protons and neutrons were bombarded with high-energy electrons have actually offered indications that protons and neutrons are not amorphous masses however made up of unique subparticles. The subparticles have been named partons, and whether they represent the hypothetical quarks stays a moot concern.

Update

The so-called partons seen in experiments at the Stanford Linear Accelerator Center were certainly quarks– a discovery that won three scientists the 1990 Nobel Reward in physics ( SN: 10/27/90, p. 263). Predicted by physicists Murray Gell-Mann and George Zweig in 1964, quarks are the foundation of most of deep space’s common matter. Quarks were initially believed to can be found in three ranges: up, down and odd. Particle collider experiments have actually exposed 3 extra types: appeal, bottom and top ( SN: 4/30/94, p. 276). Quarks normally can be found in sets or trios. Recently, physicists have glimpsed more fancy tetraquarks and pentaquarks ( SN: 8/1/20, p. 14).