Protons are tiny subatomic particles that, along with neutrons, form the nucleus of an atom. The heavier the atom, the more protons (and neutrons) it contains.

Protons have a positive charge. Two protons repel each other. Electrons have a negative charge. Two electrons repel each other. A proton and an electron have opposite charges and attract each other.

Scientists are holding up a 'mirror' to protons and neutrons to learn more about the particles that build our visible universe. The MARATHON experiment has accessed new details about these ...

The Spallation Neutron Source fires beams of protons to a target filled with mercury, producing neutrons that are then directed to various research instruments.

Nucleons, which include protons and neutrons, are the composite particles that make up atomic nuclei. While these particles have been widely studied in the past, their internal structure has not yet ...

The strong force holds protons and neutrons together, but the theory behind it is largely inscrutable. Two new approaches show how it works.

Long-sought clumps of four neutrons called tetraneutrons last less than a billionth of a trillionth of a second, an experiment suggests.

Worse, protons and neutrons are actually made of three smaller particles called quarks, each connected by a very strong force — called the strong force — holding them together. So talking ...