Related Clues:

• Lepton's locale
• Quantum physics particle
• Physicist's subject
• Small matter?
• Small bit
• Bit of nuclear physics
• Supercollider projectile
• Sometimes it gets smashed
• Proton's place
• Cyclotron bit
• Particle in a quark model
• Teeny bit
• Source of nuclear energy
• Nuclear energy source
• Smallest amount