Proton radius mystery deepens as deuterium measurement comes up short. Improving mass accuracy. In a commentary written to accompany the research, Niels Madsen of Swansea University in the UK points ...

A new detector sensitive to low-mass dark matter particles too light for current experiments to see has been proposed by physicists in the US. Built around a bath of superfluid helium-4, the device ...

All the latest science news on helium gas from Phys.org. Find the latest news, ... It is a black hole with a mass of 17 billion ... A hybrid matter—an antimatter helium atom containing an ...

An elusive type of atom known as pionic helium has been directly excited by laser light for the first time. The work establishes a promising experimental platform for probing fundamental physics ...

Laser physicists have captured an atomic-level event – an electron being ejected from a helium atom after being struck by a photon – with an accuracy of a trillionth of a billionth of a second ...

“Our understanding of these processes within the helium atom provides us with a tremendously reliable basis for future experiments,” explains Martin Schultze, a specialist in laser physics at ...