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.

Based on calculations using the laser frequency, the researchers found that the helium nucleus' charge radius is 1.6782 femtometers. Measurements made by bouncing electrons off the nucleus ...

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 ...

Size of helium nucleus measured more precisely than ever before. Paul Scherrer Institute. Journal Nature DOI 10.1038/s41586-021-03183-1 ...

The charge radius is a statistical measure of how far the electric charge of a particle extends into space. Both groups were ...

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

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.

More information: Koichiro Yasuda et al, Neutrinos and Gamma Rays from Beta Decays in an Active Galactic Nucleus NGC 1068 Jet, Physical Review Letters (2025). DOI: 10.1103/PhysRevLett.134.151005 ...

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.