context: The neutron subatomic particle was initially thought to be an elementary particle (not made up of smaller particles) but later this belief was mistaken [1], its mass is almost equal to the mass of a proton, found in the nuclei of atoms, as can It is located outside it where it is called the free neutron. The free neutron is unstable and has an average lifetime of about 886 seconds (about 15 minutes), after which it breaks down shortly into a proton and electron. And because neutrons are not charged, it makes it difficult to detect or control them, which delays their discovery. It was discovered by physicist Nobel Prize winner James Shadwick.
question: What is a neutron?
answers.text: subatomic particle