Many heavy atoms form from a supernova explosion, the remnants of which are shown in this image. NASA/ESA/Hubble Heritage ...

Data from oceans, ice and the air all point to the same thing: rising invisible heat. What experiments are working, and what kinds of trials do we need to stop?

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

An atom consists of a heavy center, called the nucleus, made of particles called protons and neutrons. An atom has lighter ...

Different isotopes are distinguished by the number of neutrons in the nucleus: helium-3 contains one neutron alongside the two protons, while the heavier helium-4 contains two neutrons.

"Our experiments with muonic helium-3 provide the most accurate value to date for the charge radius of this nucleus," says Randolf Pohl, who is also a member of the PRISMA + Cluster of Excellence ...

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.

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.

This is where a radioactive form of strontium (strontium-94) absorbs an alpha particle (a helium nucleus), then emits a neutron and transforms into zirconium-97. The study has been published as an ...

This rare form of helium is called helium-3 because it has two protons and one neutron in its nucleus. Normal helium, which is 700,000 times more common than helium-3, is called helium-4 because ...