Definition

Noun 1. An unstable subatomic particle with a negative electric charge and the same mass as a proton; the antimatter counterpart of a proton. - In particle physics, an antiproton is the antiparticle of the proton. It has the same mass as a proton but carries a negative charge. When a proton and an antiproton meet, they annihilate each other, converting their mass into energy.

Usage Examples

• Noun:
  • Scientists at CERN create and study antiprotons in particle accelerators.
  • The existence of the antiproton was confirmed experimentally in 1955.
  • In theory, an atom of antihydrogen would consist of an antiproton and a positron.

Advanced Usage

• "Antiproton Decelerator (AD)": A specialized facility at CERN designed to slow down antiprotons so they can be studied more easily.
  • The Antiproton Decelerator is crucial for experiments on antimatter.
• "Antiproton-proton annihilation": The process where a proton and an antiproton collide and are converted into other particles or energy.
  • The signature of antiproton-proton annihilation is a burst of high-energy photons or pions.

Variants and Related Words

• Antimatter (n): Matter composed of antiparticles, such as antiprotons, antineutrons, and positrons.
  • If matter and antimatter meet, they annihilate each other.
• Positron (n): The antiparticle of the electron; it has a positive charge.
  • A positron and an antiproton are components of antihydrogen.

Synonyms

• Negative proton (This is a descriptive synonym, though "antiproton" is the standard scientific term).

Related Phrases and Concepts

• Baryon number: A quantum number conserved in particle interactions. A proton has a baryon number of +1, while an antiproton has a baryon number of -1.
• Antinucleus: A nucleus composed of antiprotons and antineutrons.
  • Creating a stable antinucleus is an extreme technical challenge.

Noun

1. an unstable negatively charged proton; the antiparticle of a proton