41. For example, atomic electrons can exist in excited states and even the atomic nucleus can have excited states as well. 42. For the rest of his career Kaluza continued to produce ideas about relativity and about models of the atomic nucleus . 43. His theoretical discovery concerned strong force, which acts in an atomic nucleus between the quarks inside the proton and the neutron. 44. Like NMR spectroscopy, M�ssbauer spectroscopy probes tiny changes in the energy levels of an atomic nucleus in response to its environment. 45. He studied under Lord Ernest Rutherford, the Nobel Prize Laureate who had gained acclaim for the discovery of the atomic nucleus . 46. That process is the reverse of " annihilation to one photon " allowed in the electric field of an atomic nucleus . 47. At that difficult time Nikolay Semyonov and Pyotr Kapitsa, discovered a way to measure the magnetic field of an atomic nucleus . 48. However, the neutrons in the tritium nucleus increase the attractive strong nuclear force when brought close enough to another atomic nucleus . 49. The extra dimensions in the Berkeley theory would still be much smaller than an atomic nucleus , but larger than compactified dimensions. 50. Some of the alpha particles of a defined energy are backscattered to the detector if they collide with an atomic nucleus .
