Goldhaber experiment

The Goldhaber experiment demonstrated that neutrons inside an atom are not perfectly stationary but have a property called "momentum." By measuring the slight differences in momentum of neutron pairs emitted during radioactive decay, scientists confirmed that neutrons behave like quantum particles with intrinsic momentum distribution. This experiment provided evidence for the quantum nature of subatomic particles and helped scientists understand how particles like neutrons are structured inside an atom. Essentially, it revealed that neutrons are not just static building blocks but dynamic entities with measurable motion at the quantum level.