who discovered the neutron

The neutron was discovered by the English physicist James Chadwick in 1932. Chadwick conducted experiments at the Cavendish Laboratory in Cambridge, England, where he bombarded beryllium with alpha particles and observed a new type of penetrating radiation. He demonstrated that this radiation was caused by a neutral particle with a mass approximately equal to that of the proton, which he identified as the neutron. His discovery resolved inconsistencies in atomic mass and nuclear structure and earned him the Nobel Prize in Physics in 1935