dorsal/arxiv
View SchemaEffects of spinor distortion and density-dependent form factors upon $^{16}O(\vec{e},e'\vec{p})$
| Authors | James J. Kelly |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9905024 |
| URL | https://arxiv.org/abs/nucl-th/9905024 |
| DOI | 10.1103/PhysRevC.60.044609 |
| Journal | Phys.Rev. C60 (1999) 044609 |
Abstract
We propose an effective current operator for nucleon electromagnetic knockout that incorporates spinor distortion and density-dependent nucleon form factors using an effective momentum approximation. This method can be used in a coordinate-space approach with either relativistic or nonrelativistic optical potentials and overlap functions. We studied these effects for the $^{16}O(\vec{e},e' \vec{p})$ reaction at Q^2 = 0.8 (GeV/c)^2. Spinor distortion substantially enhances the left-right asymmetry while reducing the ratio between sideways and longitudinal recoil polarization for p-shell knockout by about 5% for modest missing momenta. We also find that the density dependence of nucleon form factors suggested by a quark-meson coupling model reduces the polarization ratio further. Much larger effects are obtained for the s-shell than for p-shell. However, both effects are subject to much larger Gordon ambiguities than comparable nonrelativistic calculations.
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"abstract": "We propose an effective current operator for nucleon electromagnetic knockout\nthat incorporates spinor distortion and density-dependent nucleon form factors\nusing an effective momentum approximation. This method can be used in a\ncoordinate-space approach with either relativistic or nonrelativistic optical\npotentials and overlap functions. We studied these effects for the\n$^{16}O(\\vec{e},e\u0027 \\vec{p})$ reaction at Q^2 = 0.8 (GeV/c)^2. Spinor distortion\nsubstantially enhances the left-right asymmetry while reducing the ratio\nbetween sideways and longitudinal recoil polarization for p-shell knockout by\nabout 5% for modest missing momenta. We also find that the density dependence\nof nucleon form factors suggested by a quark-meson coupling model reduces the\npolarization ratio further. Much larger effects are obtained for the s-shell\nthan for p-shell. However, both effects are subject to much larger Gordon\nambiguities than comparable nonrelativistic calculations.",
"arxiv_id": "nucl-th/9905024",
"authors": [
"James J. Kelly"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.60.044609",
"journal_ref": "Phys.Rev. C60 (1999) 044609",
"title": "Effects of spinor distortion and density-dependent form factors upon $^{16}O(\\vec{e},e\u0027\\vec{p})$",
"url": "https://arxiv.org/abs/nucl-th/9905024"
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