Yet another type of radioactivity is spontaneous fission.
In this process the nucleus splits into two fragment nuclei of roughly half the mass of the parent.
The law of conservation of angular momentum requires that the sum of angular momenta of the radiation and daughter nucleus is equal to the angular momentum (spin) of the parent.
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Alpha or beta decay may simply proceed directly to the ground (lowest energy) state of the daughter nucleus without gamma emission, but the decay may also proceed wholly or partly to higher energy states (excited states) of the daughter.
In the latter case, gamma emission may occur as the excited states transform to lower energy states of the same nucleus.
The proton is the nucleus of ordinary hydrogen and is stable.