Electrons confined above the surface of liquid helium form an exceptionally clean two-dimensional electron system, free from the disorder that characterises semiconductor interfaces. Repelled by their ...

Scientists describe the configuration and energy levels of antiprotonic helium that can potentially be produced by colliding slow antiprotons with ordinary helium at CERN. Exotic subatomic particles ...

This video explores the fascinating reasons behind the physical properties of elements. It answers questions about why ...

Exotic subatomic particles that are like 'normal' particles apart from one, opposite, property - such as the positron, which is like an electron but positively rather than negatively charged - are ...