The negatively charged antiparticle of a proton.
- Positrons, antiprotons and other antiparticles can be routinely created at particle accelerator labs and can even be trapped and stored for days or weeks at a time.
- The antiproton was produced when protons from a cyclotron were used to bombard a copper target.
- The antiprotons - which are negatively charged, like electrons - took up orbits around nuclei.
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