Nuclear dependence of the coherent eta photoproduction reaction in a relativistic approach

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dc.creatorAbu-Raddad, L. J.
dc.creatorPiekarewicz, J.
dc.creatorSarty, A. J.
dc.creatorBenmerrouche, M.
dc.date1997-10-01
dc.date.accessioned2026-07-07T11:11:22Z
dc.date.available2026-07-07T11:11:22Z
dc.descriptionWe study the nuclear (or A) dependence of the coherent eta photoproduction reaction in a relativistic impulse approximation approach. We use a standard relativistic parameterization of the elementary amplitude, based on a set of four Lorentz- and gauge-invariant amplitudes, to calculate the coherent production cross section from He-4, C-12, and Ca-40. In contrast to nonrelativistic treatments, our approach maintains the full relativistic structure of the process. The nuclear structure affects the process through the ground-state tensor density. This density is sensitive to relativistic effects and depends on A in a different manner than the vector density used in nonrelativistic approaches. This peculiar dependence results in He-4 having a cross section significantly smaller than that of C-12---in contrast to existent nonrelativistic calculations. Distortion effects are incorporated through an eta-nucleus optical potential that is computed in a simple ``t rho'' approximation.
dc.description4 pages, 3 postscript figures. The replace is due to a misspelling in the Authors' list
dc.identifierhttps://arxiv.org/abs/nucl-th/9710005
dc.identifierhttp://arxiv.org/abs/nucl-th/9710005
dc.identifierPhys.Rev.C57:2053-2056,1998
dc.identifierdoi:10.1103/PhysRevC.57.2053
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/191075
dc.subjectNuclear Theory
dc.titleNuclear dependence of the coherent eta photoproduction reaction in a relativistic approach
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