Channel Coupling in $A(\vec{e},e^{\prime }\vec{N})B$ Reactions

Abstract

The sensitivity of momentum distributions, recoil polarization observables, and response functions for nucleon knockout by polarized electrons to channel coupling in final-state interactions is investigated using a model in which both the distorting and the coupling potentials are constructed by folding density-dependent effective interactions with nuclear transition densities. Calculations for ${}^{16}$O are presented for 200 and 433 MeV ejectile energies, corresponding to proposed experiments at MAMI and TJNAF, and for ${}^{12}$C at 70 and 270 MeV, corresponding to experiments at NIKHEF and MIT-Bates. The relative importance of charge exchange decreases as the ejectile energy increases, but remains significant for 200 MeV. Both proton and neutron knockout cross sections for large recoil momenta, $p_m>300$ MeV/c, are substantially affected by inelastic couplings even at 433 MeV. Significant effects on the cross section for neutron knockout are also predicted at smaller recoil momenta, especially for low energies. Polarization transfer for proton knockout is insensitive to channel coupling, even for fairly low ejectile energies, but polarization transfer for neutron knockout retains nonnegligible sensitivity to channel coupling for energies up to about 200 MeV. The present results suggest that possible medium modifications of neutron and proton electromagnetic form factors for $Q^2\gtrsim 0.5(GeV/c{)}^2$ can be studied using recoil polarization with relatively little sensitivity due to final state interactions.

Substantially revised version accepted by Phys. Rev. C; shortened to 49 pages including 21 figures

References in corpus (7)

• In-medium electron-nucleon scattering
• Medium dependence of the bag constant in the quark-meson coupling model
• Measurement of the Induced Proton Polarization P_n in the 12C(e,e'\vec{p}) Reaction
• Approximate Coulomb distortion effects in (e,e'p) reactions
• The neutron charge form factor in helium-3
• Recent results from QMC relevant to TJNAF
• Inclusion of virtual nuclear excitations in the formulation of the (e,e'N)

Cited by in corpus (34)

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• Analysis of flux-integrated cross sections for quasi-elastic neutrino charged-current scattering off ${}^{12}$C at MiniBooNE energies
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• Neutrino neutral-current elastic scattering on 12C
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• Quasi-elastic neutrino charged-current scattering cross sections on oxygen
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• Relativistic calculation of nuclear transparency in (e,e'p) reactions
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• Quasi-elastic neutrino charged-current scattering off C-12
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• RPWIA analysis of dynamical relativistic contributions in ${}^{16}O(\vec{e},e^{\prime }\vec{p})$ reactions
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• Off-shell effects in the relativistic mean field model and their role in CC (anti)neutrino scattering at MiniBooNE kinematics
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• Induced Nucleon Polarization and Meson-Exchange Currents in (e,e'p) Reactions
• Inclusive electron scattering off ${}^{12}$C, ${}^{40}$Ca, and ${}^{40}$Ar: effects of the meson exchange currents
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