Energy aspect of photon spin

The purpose of this work is to check the energy balance of a hydrogen-like atom and a photon with spin. The relevance of the work is determined by the role of photons in theoretical and applied research. The following theorem has been proved: the spin of a photon is equal to zero. Taking into account the result obtained, several assumptions can be made, for example, the defect of the angular momentum of an atom during radiation can be attributed to the atomic nucleus and even to an electron. In the latter case, the reorientation of the electron spin is just equal to , i.e. momentum defect. Another assumption is that if we assume that the "linear" energy of a photon is , and the "spin" energy is , then the energy balance of the radiation of the atom is not violated. In the light of the theorem, the angular momentum of a light beam is not determined by the spins of photons.