Helium is the simplest element in the periodic table with more than one particle in its nucleus, yet state of the art theory and experiments on it don't add up.

An international research team led by the Paul Scherrer Institute PSI has measured the radius of the nucleus of muonic helium-3 with unprecedented precision. The results are an important stress ...

A research team has achieved a significant breakthrough in determining fundamental properties of atomic nuclei. The team conducted laser spectroscopy experiments on muonic helium-3. Muonic helium ...

Atoms are very small. They have a radius of around 1 × 10 10 metres.. The modern view of the atom close atom The smallest part of an element that can exist. is of a nucleus close nucleus The ...

For example, a helium atom has an atomic mass of 4, but an atomic number (or positive charge) of 2. Since electrons have almost no mass, it seemed that something besides the protons in the nucleus ...

The tests used uranium that had been stripped of all but two of its normal swarm of 92 electrons to form an ion, or electrically charged atom. This uranium ion is termed “helium-like uranium ...