Jose M. Udias

Spectroscopic factors in CA-40 and PB-208 from (E,E'P) - fully relativistic analysis

We present results for spectroscopic factors of the outermost shells in

Relativistic versus nonrelativistic optical potentials in A ( e , e ’ p ) B reactions

^{40}mathrm{Ca}

Inelastic ν and ν scattering on nuclei and “strangeness” of the nucleon

and

On the scissors type mode in 46Ti and lighter nuclei

^{208}mathrm{Pb}

The ratio of p and n yields in NC neutrino (anti-neutrino) nucleus scattering and strange form-factors of the nucleon

, which have been derived from the comparsion between the available quasielastic (e,ep) data from NIKHEF-K and the corresponding calculated cross sections obtained within a fully relativistic formalism. We include exactly the effect of Coulomb disortion on the electron wave functions and discuss its role in the extraction of the spectroscopic factors from experiment. Without any adjustable parameter, we find spectroscopic factors of about 70%, consistent with theoretical predictions. We compare our results with previous relativistic and nonrelativistic analyses of (e,ep) data. In addition to Coulomb distortion effects, we discuss different choices of the nucleon current operator and also analyze the effects due to the relativistic treatment of the outgoing-distorted and bound nucleon wave functions.

PROBING DEFORMED ORBITALS WITH A(E,E'N)B REACTIONS

We investigate the role of relativistic and nonrelativistic optical potentials used in the analysis of (

1+ Excitations in light nuclei: SU(3) versus realistic shell model results

e,ep

Spin Dependent Momentum Distributions in Deformed Nuclei

) data. We find that the relativistic calculations produce smaller (

Scattering of polarized electrons from deformed nuclei: The case of elastic and inelastic scattering to discrete states in 21Ne

e,ep

Neutron densities from parity-violating elastic electron scattering

) cross sections even in the case in which both relativistic and nonrelativistic optical potentials fit equally well the elastic proton--nucleus scattering data. Compared to the nonrelativistic impulse approximation, this effect is due to a depletion in the nuclear interior of the relativistic nucleon current, which should be taken into account in the nonrelativistic treatment by a proper redefinition of the effective current operator.