Data di Pubblicazione:
2002
Abstract:
We analyze the role of meson exchange currents MECs in photon- and electron-induced one nucleon emission reactions in a fully relativistic model. The relativistic mean-field theory is used for the bound state
and the Pauli reduction for the scattering state. Direct one-body and exchange two-body terms in the nuclear current are considered. Results for the 12C(g ,p) and 16O(g ,p) differential cross sections and photon asymmetries are displayed in an energy range between 60 and 196 MeV. The two-body seagull current affects the cross section less than in nonrelativistic analyses. In the case of the 16O(g ,n) differential cross section, MECeffects are large but not sufficient to reproduce the data. MECs have a small effect on (e,e'p) calculations.
and the Pauli reduction for the scattering state. Direct one-body and exchange two-body terms in the nuclear current are considered. Results for the 12C(g ,p) and 16O(g ,p) differential cross sections and photon asymmetries are displayed in an energy range between 60 and 196 MeV. The two-body seagull current affects the cross section less than in nonrelativistic analyses. In the case of the 16O(g ,n) differential cross section, MECeffects are large but not sufficient to reproduce the data. MECs have a small effect on (e,e'p) calculations.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
electromagnetic reactions on nuclei; relativistic models; meson-exchange currents
Elenco autori:
Meucci, Andrea; Giusti, Carlotta; Pacati, Francodavide
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