In-medium electron-nucleon scattering

Abstract

In-medium nucleon electromagnetic form factors are calculated in the quark meson coupling model. The form factors are typically found to be suppressed as the density increases. For example, at normal nuclear density and $Q^2 \sim 0.3 { GeV}^2$, the nucleon electric form factors are reduced by approximately 8% while the magnetic form factors are reduced by only 1 - 2%. These variations are consistent with current experimental limits but should be tested by more precise experiments in the near future.Comment: 14 pages, latex, 3 figure

Properties of the bound nucleons

“…The results of the studies are consistent with the results of other solitonic approaches which include explicit vector meson degrees of freedom [13] both qualitatively and quantitatively. Our results are also consistent with the QMC model calculations [12] at a qualitative level although there are discrepancies in detail. Ideas within the present model may be useful in constructing a more consistent theory which evaluates the many-body systems and its constituents on the same footing.…”

“…One can note that with the density increased q 2 dependence of G p * E falls off faster in comparison with the case in free space. The similar qualitative results have been obtained in the framework of the quark meson coupling (QMC) model [12]. However, at a quantitative level, our results are different from those in the QMC model.…”

“…However, at a quantitative level, our results are different from those in the QMC model. For comparison, at the normal nuclear matter ρ = ρ 0 and at the value of q 2 = 0.3 GeV 2 the proton charge form factor is reduced by about 30 % from that in free space value within our approach while it is reduced only by about 8 % within the QMC model [12]. In the case of the neutron electric form factor G n * E (q 2 ) the difference is the other way around.…”

Effects of Density-Dependent Weak Form Factors and Final State Interaction for Neutrino-Nucleus Scattering in the Quasi-Elastic Region

“…We take the density-dependence of the weak form factors generated by the QMC model [1][2][3][4]. Detailed features of the form factors and their modifications in nuclear matter used in this study are found at Ref.…”

“…For the nuclear medium modification, the weak form factors with the density-dependence in the quark-meson-coupling (QMC) model was calculated by the Adelaide group [1][2][3][4]. This model successfully described various properties of hadrons in nuclear medium, finite nuclei [5], and hypernuclei [6].…”