Aiming to be the world’s highest-density source


This facility produces fast neutrons by stopping a beam of protons in a block of tungsten. These fast neutrons are slowed by scattering in heavy water at room temperature, then slowed further in superfluid (liquid) helium. This facility is capable of capturing neutrons at observable speeds of 7 metres per second or 25km per hour.At this speed, neutrons can be trapped inside special “bottles” and observed.The flagship experiment for the UCN facility will be a world-leading search for the neutron electric dipole moment of the neutron, which may help us better understand matter-antimatter asymmetry and progress research beyond the Standard Model of particle physics.


A subatomic particle that carries a positive electrical charge; also the atomic nucleus of hydrogen


A subatomic particle that carries no electric charge; neutrons join with protons to create the nuclei of all atoms.


A liquid that has zero viscosity – superfluids can flow across a surface without losing energy due friction with the surface

Electric Dipole Moment

The electric dipole moment is a measure of the separation of positive and negative electrical charges within a system. The dipole moment’s size is affected by the difference in electronegativity and the distance between the charges

Matter-Antimatter Asymmetry

The Big Bang should have created equal amounts of matter and antimatter, but everything we see from in the universe is made almost entirely of matter. There is not much antimatter to be found. What happened to the antimatter?

Standard Model

Developed in the early 1970's, the Standard Model of particle physics classifies the known building blocks of the universe, elementary particles, and explains their interactions with both each other and with 3 of 4 fundamental forces.