Relativistic nuclear structure effects in quasielastic neutrino scattering.

Charged-current cross sections are calculated for quasielastic neutrino and antineutrino scattering using a relativistic meson-nucleon model. We examine how nuclear-structure effects, such as relativistic random-phaseapproximation (RPA) corrections and momentum-dependent nucleon selfenergies, influence the extraction of the axial form factor of the nucleon. RPA corrections are important only at low-momentum transfers. In contrast, the momentum dependence of the relativistic self-energies changes appreciably the value of the axial-mass parameter, MA, extracted from dipole fits to the axial form factor. Using Brookhaven’s experimental neutrino spectrum we estimate the sensitivity of MA to various relativistic nuclear-structure effects. Email : [email protected] Email : [email protected] Email : [email protected]