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.

The helium-3 that PSI physicist and ETH Zurich professor Antognini is using in the current experiment lacks not only a neutron in the nucleus, but also both electrons that orbit this nucleus.

The swelling helium nucleus, researchers say, is a sort of mini-laboratory for testing nuclear theory because it’s like a microscope — it can magnify deficiencies in theoretical calculations.

Richard Feynman, a famous theoretical physicist who won the Nobel Prize, said that if he could pass on only one piece of ...

The nucleus of tritium has one proton and two neutrons. When it is struck by a highspeed proton (a nucleus of ordinary hydrogen), the two combine into helium and yield a great jolt of energy (see ...

Meanwhile, the helium-3 nucleus can then fuse with another helium-3 nucleus formed through the same process, creating helium-4 (2 protons, 2 neutrons) and emitting two other protons.

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 ...

The swelling helium nucleus, researchers say, is a sort of mini-laboratory for testing nuclear theory because it’s like a microscope—it can magnify deficiencies in theoretical calculations.