dorsal/arxiv
View SchemaNuclear dependence of the coherent eta photoproduction reaction in a relativistic approach
| Authors | L. J. Abu-Raddad, J. Piekarewicz, A. J. Sarty, M. Benmerrouche |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9710005 |
| URL | https://arxiv.org/abs/nucl-th/9710005 |
| DOI | 10.1103/PhysRevC.57.2053 |
| Journal | Phys.Rev.C57:2053-2056,1998 |
Abstract
We 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.
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"abstract": "We study the nuclear (or A) dependence of the coherent eta photoproduction\nreaction in a relativistic impulse approximation approach. We use a standard\nrelativistic parameterization of the elementary amplitude, based on a set of\nfour Lorentz- and gauge-invariant amplitudes, to calculate the coherent\nproduction cross section from He-4, C-12, and Ca-40. In contrast to\nnonrelativistic treatments, our approach maintains the full relativistic\nstructure of the process. The nuclear structure affects the process through the\nground-state tensor density. This density is sensitive to relativistic effects\nand depends on A in a different manner than the vector density used in\nnonrelativistic approaches. This peculiar dependence results in He-4 having a\ncross section significantly smaller than that of C-12---in contrast to existent\nnonrelativistic calculations. Distortion effects are incorporated through an\neta-nucleus optical potential that is computed in a simple ``t rho\u0027\u0027\napproximation.",
"arxiv_id": "nucl-th/9710005",
"authors": [
"L. J. Abu-Raddad",
"J. Piekarewicz",
"A. J. Sarty",
"M. Benmerrouche"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.57.2053",
"journal_ref": "Phys.Rev.C57:2053-2056,1998",
"title": "Nuclear dependence of the coherent eta photoproduction reaction in a relativistic approach",
"url": "https://arxiv.org/abs/nucl-th/9710005"
},
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