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Nucleon momentum distribution (NMD), particularly its high-momentumcomponents, is essential for understanding the nucleon--nucleon ($ NN $)correlations in nuclei. Herein, we develop the studies of NMD of$^{56}\text{Fe}$ from the axially deformed relativistic mean-field (RMF) model.Moreover, we introduce the effects of $ NN $ correlation into the RMF modelfrom phenomenological models based on deuteron and nuclear matter. For theregion $ k<k_{\text{F}} $, the effects of deformation on the NMD of the RMFmodel are investigated using the total and single-particle NMDs. For the region$ k>k_{\text{F}} $, the high-momentum components of the RMF model are modifiedby the effects of $ NN $ correlation, which agree with the experimental data.Comparing the NMD of relativistic and non-relativistic mean-field models, therelativistic effects on nuclear structures in momentum space are analyzed.Finally, by analogizing the tensor correlations in deuteron and Jastrow-typecorrelations in nuclear matter, the behaviors and contributions of $ NN $correlations in $^{56}\text{Fe}$ are further analyzed, which helps clarify theeffects of the tensor force on the NMD of heavy nuclei.

Nucleon momentum distribution of $^{56}\text{Fe}$ from the axially deformed relativistic mean-field model with nucleon--nucleon correlations