Nuclear dependence of the coherent [Formula Presented] photoproduction reaction in a relativistic approach

L. J. Abu-Raddad, J. Piekarewicz, A. J. Sarty, M. Benmerrouche

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Abstract

We study the nuclear (or [Formula Presented] dependence of the coherent [Formula Presented] photoproduction reaction in a relativistic impulse approximation approach. We use a standard relativistic parametrization of the elementary amplitude, based on a set of four Lorentz- and gauge-invariant amplitudes, to calculate the coherent production cross section from [Formula Presented], [Formula Presented], and [Formula Presented]. 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 [Formula Presented] in a different manner than the vector density used in nonrelativistic approaches. This peculiar dependence results in [Formula Presented] having a cross section significantly smaller than that of [Formula Presented]—in contrast to existent nonrelativistic calculations. Distortion effects are incorporated through an [Formula Presented]-nucleus optical potential that is computed in a simple “[Formula Presented]” approximation.

Original languageEnglish
Pages (from-to)2053-2056
Number of pages4
JournalPhysical Review C - Nuclear Physics
Volume57
Issue number4
DOIs
Publication statusPublished - 1 Jan 1998

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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