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Decoupling of total electronic and nuclear spin moments of Cs atoms inexternal magnetic field for the case of atomic $D_1$ line, leading to onset ofthe hyperfine Paschen-Back regime has been studied theoretically andexperimentally. Selective reflection of laser radiation from an interface ofdielectric window and atomic vapor confined in a nanocell with 300 nm gapthickness was implemented for the experimental studies. The real timederivative of selective reflection signal with a frequency position coincidingwith atomic transitions was used in measurements, providing $\sim$ 40 MHzspectral resolution and linearity of signal response in respect to transitionprobability. Behavior of 28 individual Zeeman transitions in a wide range oflongitudinal magnetic field (0 - 6 kG) has been tracked under excitation of Csvapor by a low-intensity $\sigma^+$- polarized cw laser radiation. For $B\ge6~$kG, only 8 transitions with nearly equal probabilities and the samefrequency slope remained in the spectrum, which is a manifestation of thehyperfine Paschen-Back regime. The obtained experimental results are consistentwith numerical modeling. Due to small divergence of selective reflectionsignal, as well as sub-wavelength thickness and sub-Doppler spectral linewidthinherent to nanocell, the employed technique can be used for distant remotesensing of magnetic field with high spatial and $B$-field resolution.

Decoupling of hyperfine structure of Cs $D_1$ line in strong magnetic field studied by selective reflection from a nanocell