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We establish the existence of spin-statistic selection rules (SSSR) formulti-equal-photon transitions in atomic systems. These selection rules aresimilar to those for systems of many equivalent electrons in atomic theory. Thelatter ones are the direct consequence of Pauli exclusion principle. In thissense the SSSR play the role of the exclusion principle for photons: theyforbid some particular states for the photon systems. We established severalSSSR for few-photon systems. 1) First rule (SSSR-1): two-equivalent photonsinvolved in any atomic transition can have only even values of the totalangular momentum J. This selection rule is an extension of the Landau-Yangtheorem to the photons involved in atomic transitions. 2) second rule (SSSR-2):three equivalent dipole photons involved in any atomic transition can have onlyodd values of the total angular momentum J=1,3. 3) third rule (SSSR-3): fourequivalent dipole photons involved in any atomic transition can have only evenvalues of the total angular momentum J=0,2,4. We also suggest a method for apossible experimental test of these SSSR by means of laser experiments.

Spin-Statistic Selection Rules for Multi-Equal-Photon Transitions in Atoms: Extension of the Landau-Yang Theorem to Multiphoton Systems