Antiproton

An antiproton is the antimatter counterpart of a proton.

Antiprotons are stable, but are typically short-lived, since any collision with a proton will cause both particles to be annihilated in a burst of energy.

This antiparticle has been detected by Humans first in cosmic rays, and then in galactic magnetic fields.

An alien vessel fires antiproton weapons at the USS Enterprise

Weapons

A beam of pure antiprotons is an incredibly destructive weapon. Such weapons have been used in order to destroy planets.

• Antiproton beam - a confined beam of antiprotons, similar to a proton beam in that it is tightly focused, able to penetrate any shield even if the modulations were changed.
• Antiproton cannon - a directed energy weapon based on antiprotons

Medical Use

Antiproton chambers are used in antiproton therapy sessions, which counteract the genetic unspooling caused by acute radiation syndrome using a recombination process.

Fun Facts:

• The Crystalline Entity left behind a trail of antiprotons, which allowed it to be tracked.

• Romulan disruptors left a characteristic trace of residual antiprotons, which can be used to date when the weapon was fired.

• The Jem'Hadar used antiproton beams to detect cloaked ships.

• In 2372, The Doctor on the USS Voyager used bursts of antiprotons from the warp core in order to reverse the effects of hyper-evolution two crewmembers.
  This cowboy medical method worked by destroying the mutated segments of DNA, and restored the crewmembers to normal with little reprecussions.

• The use of a cloaking device often left residual antiprotons that could expose the ship's presence.