It is more massive than collapsed stars, known as "neutron stars", but has less mass than black holes. Such "black neutron stars" were not thought possible and will mean ideas for how neutron ...

These nuclei had specific numbers of protons or neutrons, or magic numbers, as physicist Eugene Wigner called them. The race ...

He called it a neutron, and imagined it as a paired proton and electron. There was no evidence for any of these ideas. Chadwick kept the problem in the back of his mind while working on other things.