[sumocide]

Proton beams are already used in cancer therapy to destroy tumors.

[RandallFlagg]

I know. Still, protons wouldn't work because protons are a component of ordinary matter. What's needed is a component of antimatter -preferably a positron (an anti-electron)

The three components of matter: Proton, neutron and electron.

The three components of antimatter:
Antiproton, antineutron and positron.