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

Abstract

Nucleon momentum distribution (NMD), particularly its high-momentum components, 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 model from phenomenological models based on deuteron and nuclear matter. For the region $k<k_{\text{F}}$, the effects of deformation on the NMD of the RMF model 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 modified by the effects of $NN$ correlation, which agree with the experimental data. Comparing the NMD of relativistic and non-relativistic mean-field models, the relativistic effects on nuclear structures in momentum space are analyzed. Finally, by analogizing the tensor correlations in deuteron and Jastrow-type correlations in nuclear matter, the behaviors and contributions of $NN$ correlations in ${}^{56}\text{Fe}$ are further analyzed, which helps clarify the effects of the tensor force on the NMD of heavy nuclei.

arXiv comment12 pages, 10 figures, This article has been published in SCIENCE CHINA Physics, Mechanics & Astronomy(SCPMA), and the original publication is available at www.scichina.com and www.springerlink.com

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