Data di Pubblicazione:
2003
Abstract:
The role of meson exchange currents MEC in electron- and photon-induced one-nucleon emission processes is studied in a nonrelativistic model including correlations and final state interactions. The nuclear
current is the sum of a one-body and of a two-body part. The two-body current includes pion seagull, pion-in-flight, and the isobar current contributions. Numerical results are presented for the exclusive
16O(e,e'p)15N and 16O(g ,p)15N reactions. MEC effects are in general rather small in (e,e'p), while in (g ,p) they are always large and important to obtain a consistent description of (e,e'p) and (g ,p) data, with the same
spectroscopic factors. The calculated (g ,p) cross sections are sensitive to short-range correlations at high values of the recoil momentum, where MEC effects are larger and overwhelm the contribution of correlations.
current is the sum of a one-body and of a two-body part. The two-body current includes pion seagull, pion-in-flight, and the isobar current contributions. Numerical results are presented for the exclusive
16O(e,e'p)15N and 16O(g ,p)15N reactions. MEC effects are in general rather small in (e,e'p), while in (g ,p) they are always large and important to obtain a consistent description of (e,e'p) and (g ,p) data, with the same
spectroscopic factors. The calculated (g ,p) cross sections are sensitive to short-range correlations at high values of the recoil momentum, where MEC effects are larger and overwhelm the contribution of correlations.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
electron scattering; one nucleon knockout; meson-exchange currents
Elenco autori:
Giusti, Carlotta; Pacati, Francodavide
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