Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-01-09
Phys.Rev.C55:2571-2576,1997
Physics
Nuclear Physics
Nuclear Theory
11 pages and 4 postscript figures
Scientific paper
10.1103/PhysRevC.55.2571
We study coherent eta-photoproduction from nuclei in a relativistic impulse approximation approach. For the elementary production amplitude we use a standard relativistic parameterization based on a set of four Lorentz- and gauge-invariant amplitudes. The photonuclear amplitude is evaluated without recourse to a nonrelativistic reduction; the full relativistic structure of the amplitude is maintained. On general arguments we show that the coherent process is sensitive to only one of the elementary amplitudes. Moreover, we show that the nuclear structure information is fully contained in the ground-state tensor density. The tensor density is evaluated in a mean-field approximation to the Walecka model and it is shown to be sensitive to relativistic effects. Distortion effects are incorporated through an eta-nucleus optical potential that is computed in a simple t-rho approximation.
Benmerrouche M.
Piekarewicz Jorge
Sarty A. J.
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