Journal of Physical Studies 25(1), Article 1101 [12 pages] (2021)
DOI: https://doi.org/10.30970/jps.25.1101
ELECTRIC FORM FACTORS OF NUCLEONS AND CHARGE DEUTERON FORM FACTOR
V. I. Zhaba
Uzhgorod National University, Department of Theoretical Physics,
54, Voloshyn St., Uzhgorod, UA-88000, Ukraine,
e-mail: viktorzh@meta.ua
Received 30 April 2020; accepted 29 October 2020; published online 16 February 2021
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The study reviews basic approximation dependences for the isoscalar electric form factors of the proton $G_{\rm Ep}$ and the neutron $G_{\rm EN}$. The peculiarities of their obtaining and subsequent application for approximation by experimental data are analyzed. The basic experimental data of nucleon electric form factors are described. Using the approximation dependences of this review, corresponding parameters were obtained for the electric form factors of the nucleons $G_{\rm Ep}$ and $G_{\rm EN}$. In most cases, they generally describe the experimental data fairly well. The best parameterizations for describing experimental data of the electric proton form factor $G_{\rm Ep}$ are polynomials and polynomial ratios. Experimental measurements of the electric neutron form factor $G_{\rm EN}$ are best described by the Galster parameterization. The quality of the approximation for the electric nucleon form factors is controlled by determining the charge radius of proton $r_{\rm Ep}$ and neutron $r_{\rm EN}$. According to the approximation dependences of the electric nucleon form factors and the deuteron wave functions in the coordinate representation for Reid93 and CD-Bonn potentials and DDM model, the deuteron charge form factor $G_{\rm C}(p)$ is calculated. The theoretical values of the form factor $G_{\rm C}(p)$ are compared with the experimental data of the leading collaborations and reviews. Depending on the choice of electric nucleon form factors, the secondary maximum for the deuteron charge form factor $G_{\rm C}(p)$ is located for Reid93 potential in the momentum range at $p=5.60$-5.80 fm$^{-1}$, for CD-Bonn potential at $p=6.00$-6.40 fm$^{-1}$ and for model DDM at $p=5.45$-5.65 fm$^{-1}$. The zero position is located at the momentum $p_{0}=4.60$ fm$^{-1}$ for Reid93 potential, $p_{0}=5.05$ fm$^{-1}$ for CD-Bonn potential and $p_{0}=4.45$ fm$^{-1}$ for DDM model. The numerical values of the root-mean-square charge $r_{\rm ch}$ and the structural $r_{\rm str}$ deuteron radius are in good agreement with the results of experimental and other theoretical data. Using the obtained parameters of approximation dependences for isoscalar nucleon electric form factors and known magnetic nucleon form factors, in further studies we can calculate the structure functions $A(p)$, $B(p)$, the components of tensor and vector deuteron polarizations $t_{ij}(p)$, and tensor analyzing power $A_{yy}$ and other polarization observables.
Key words: nucleon, deuteron, form factor, radius, wave function, approximation
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