A recent experiment in Germany studied the helium-4 nucleus, also known as an alpha particle. Helium-4 consists of only two protons and two neutrons, making it relatively easy to describe using ...

An unstable nucleus can emit a ‘package’ of two protons and two neutrons, called an alpha particle, to become more stable.. Alpha radiation is made up of a stream of alpha particles emitted ...

But because an alpha particle is identical to the nucleus of a helium-4 atom, it is sometimes represented as He2+, that is, a doubly ionized helium-4 atom. Rutherford's gold foil experiment explained.

Demonstration of alpha particle confinement capability in helical fusion plasmas. National Institutes of Natural Sciences. Journal Nuclear Fusion DOI ...