What is the Meaning & Definition of Neutron

At the behest of physics, a neutron is that elementary, heavy, particle that has a neutral electric charge and a mass approximately similar to the proton and forming a part of the atomic nuclei with protons. Specifically, the neutron consists of two quarks below and above a quark. Life media presenting outside the atomic nucleus neutron is fifteen minutes, when it emits an antineutron and an electron to become a proton. Those neutrons which have a mass similar to the Proton are necessary for the stability of the Atomic, with the exception of hydrogen nuclei.
Ernest Rutherford, physicist and chemist, New Zealand was the first to proclaim the existence of the neutron and then, based on this in the year 1920 is explained because the nuclei do not disintegrate by electromagnetic repulsion of the protons.
Neutrons are particles which act in nuclear reactions, which occur when a neutron drives the fission of an atom producing one larger number of neutrons which at the same time generate new fissions. According to the way in which occurs this reaction will be to a controlled reaction (the moderator in a nuclear reactor is used to harness the nuclear energy) or by an uncontrolled reaction (a critical mass of nuclear fuel is generated).
Nuclear fission is a reaction that occurs within the nucleus of the atom and develops when the heavy nucleus splits into smaller nuclei, as well as other by-products free neutrons and photons. In the case of the fission of heavy nuclei, it is an exothermic process in which large amounts of energy will be released.