The answer is Atomic Physics. Atomic physics is the study of atomic interractions.
Nuclear Physics is a field of physics, yes. It involves interactions between atomic nuclei. Nuclear fission, nuclear fusion, nuclear decay (though in some ways that is more particle physics).
Physics
Einstein has a Ph.D, so he has a degree in Physics, which was his field in Scientific studies.
Fluid Dynamics (Physics and Mechanics).
John Cockcroft was a nuclear physicist and the co-recipient of the 1951 Nobel Prize in Physics for his work on the transmutation of atomic nuclei by artificially accelerated atomic particles. He is known for his research in the field of nuclear physics and his contributions to the development of nuclear energy.
Brian Cox is a physicist. He studies astronomy and physics. His known field is Particle physics which is the study of particles referred to as matter and radiation.
The study of energy would be a specialty within the field of physics, which encompasses matter, energy, space, and time.
A physicist is a person who studies physics and does research in this field. There are a number of types of physicists including theoretical and practical.
A field of science is a specific part of science that somebody studies. E.g. the study of animals is called 'zoology'.
The field of physics that studies the interactions between time and space is called spacetime physics or, more specifically, relativistic physics. This field encompasses Albert Einstein's theories of special relativity and general relativity, which describe the behavior of objects in relation to time, space, and gravity. It explores phenomena such as time dilation, length contraction, and the curvature of spacetime.
Niels Bohr was a prominent figure in the field of Physics. His work on the atomic structure and quantum Mechanics earned him the Nobel Price in Physics in 1922
You are confused on your terminology. The terms atomicand nuclear are effectively interchangeable in the field of nuclear weapons. Both mean energy from the atomic nucleus.There are two ways to get energy from the atomic nucleusthough: fission and fusion.Fission is the splitting of large heavy nuclei into smaller lighter ones, like Uranium-235 and Plutonium-239.Fusion is the joining of small light nuclei into larger heavier ones, like Deuterium and Tritium.I hope this clarifies things.