0 an extremely small piece of matter with a positive electrical charge, produced when a radioactive atom is broken down, usually in a nuclear reaction --
1 a very small unit of matter with a positive electrical charge that is sent out by some radioactive substances --
He turned to aluminium, which emitted an alpha particle and produced sodium, which then decayed into magnesium by beta particle emission.
It then undergoes fission producing a gamma ray, an alpha particle, and a lithium ion.
Upon inspecting the zinc sulfide screen under a microscope, he noticed separate flashes of light created by individual alpha particle collisions with the screen.
A lot of this waste is alpha particle-emitting matter from the decay chains of uranium and thorium.
One hydrogen nucleus was being knocked off by the impact of the alpha particle, producing oxygen-17 in the process.
The alpha particle is trapped in a potential well by the nucleus.
The decaying atom of plutonium-239 liberates an alpha particle and a uranium-235 nucleus.
Light elements absorb more energy of the alpha particle, while alpha particles are reflected by heavy nuclei nearly with the same energy.
