Ernest Rutherford is simply a very famous chemist. He’s also known as Father of Nuclear Physics as he was the first to propose the Nuclear model with a charged nucleus in the center. He found the nucleus by his very famous gold scattering experiment.
The branch of science that deals with the fundamental particle namely nucleus is called Nuclear Physics. Nuclear Physics basically deals with the structure as we will as components of the nucleus. The properties like radius, mass etc are dealt with as we will as studied. Various models related to the nucleus as we will as their development by various scientists, their experiments, theories etc. are the part of Nuclear Physics.