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 ...

Why did they form at that time? Astronomers know from observing distant exploding stars that the size of the universe has ...

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. Professor Pohl ...

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 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 ...