Circular and linear devices used to produce high-energy high-speed beams of charged particles, such as electrons, protons, or heavy ions. Used for research in high-energy and nuclear physics, radiation research, medical and some industrial applications. This category is designed for sites providing information on specific accelerator operating facilities ( not Research Centers or Experiments ). It will also include links for education, publications and news, software, and equipment and service providers.

Not main-stream.

Study of elementary particles of astronomical origin.

It should be fairly self-evident that this category is for educating about nuclear and particle physics, from a physics teacher's or student's point of view. Educational materials of all types are welcome, especially those which explain this somewhat opaque subject in a clear way. Sites related to 'issues' surrounding nuclear energy should probably be put in 'Society/Issues.'

Experiments let us learn about elementary particles and their interactions. More editors are needed here to add more experiments.

Neutrinos are some of the most difficult to observe elementary particles. They interact only weakly. Most of them escape without detection, only a tiny fraction of them can be seen. There are three kinds of neutrinos: electron neutrino, muon neutrino and tau neutrino. Neutrinos can oscillate i.e. they can change their identity in flight and transform from one kind of neutrino into another kind of neutrino. Sources of observed neutrinos include: nuclear reactors, accelerator beams, radioactive sources, secondary particles created by interaction of cosmic rays in the atmosphere, Sun, supernovae. Other possible sources are: dark matter, gamma ray bursts, active galactic nuclei, relic neutrinos, Earth interior.

Traditionally elementary particle research was done mostly with accelerators (fixed target and colliders). Other experiments have recently become more popular, especially as the largest (highest energy) accelerators became very expensive.

Scientists working in the field of particle physics.

Publications: print and electronic.

Institutions and sites with elementary particle experiments. Frequently centered around a large particle accelerator. Websites only covering one group within such Institutes are concentrated in the Research Groups subcategory.

Software libraries and programs used by particle physicists.