Write a short note on the discovery of neutron ?

1. Bothe and Becker found that when beryllium is bombarded with α -particles of energy 5Mev, which emitted a highly penetrating radiation.
2. The equation can be written for the above process is ${ }_4^9\mathrm{Be}{+}_2^4\mathrm{He}{\to }_6^{13}\mathrm{C}+\mathrm{\gamma }$(radiation)
3. These radiations are not affected by the electric and magnetic fields.
4. In 1932, James Chadwick, had subjected nitrogen and argon to the beryllium radiation. He interpreted the experimental results by assuming that the radiation is of a new kind of particles which have no charge and mass nearly is equal to proton.
These neutral particles were names as ‘Neutrons’. Thus the neutron was discovered $\left[{ }_0{\mathrm{n}}^1\right]$.
5. The equation can be written as
${ }_4^9\mathrm{Be}{+}_2^4\mathrm{He}{\to }_6^{12}\mathrm{C}{+}_0{\mathrm{n}}^1+\mathrm{Q}$