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Simple and efficient "\lambda-method" and "\lambda/2-method" (\lambda is theresonant wavelength of laser radiation) based on nanometric-thickness cellfilled with rubidium are implemented to study the splitting of hyperfinetransitions of 85Rb and 87Rb D_1 line in an external magnetic field in therange of B = 0.5 - 0.7 T. It is experimentally demonstrated from 20 (12) Zeemantransitions allowed at low B-field in 85Rb (87Rb) spectra in the case of\sigma+ polarized laser radiation, only 6 (4) remain at B > 0.5 T, caused bydecoupling of the total electronic momentum J and the nuclear spin momentum I(hyperfine Paschen-Back regime). The expressions derived in the frame ofcompletely uncoupled basis (J, m_J ; I, m_I) describe very well theexperimental results for 85Rb transitions at $B > 0.6 T (that is amanifestation of hyperfine Paschen-Back regime). A remarkable result is thatthe calculations based on the eigenstates of coupled (F, m_F) basis, whichadequately describe the system for low magnetic field, also predict reductionof number of transition components from 20 to 6 for 85Rb, and from 12 to 4 for87Rb spectrum at B > 0.5 T. Also, the Zeeman transitions frequency shift,frequency interval between the components and their slope versus $B$ are inagreement with the experiment.

Hyperfine Paschen-Back regime in alkali metal atoms: consistency of two theoretical considerations and experiment