dorsal/arxiv
View SchemaRelativistic effects in electromagnetic nuclear responses in the quasi-elastic delta region
| Authors | J. E. Amaro, M. B. Barbaro, J. A. Caballero, T. W. Donnelly, A. Molinari |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9905035 |
| URL | https://arxiv.org/abs/nucl-th/9905035 |
| DOI | 10.1016/S0375-9474(99)00334-6 |
| Journal | Nucl.Phys.A657:161-186,1999 |
Abstract
A new non-relativistic expansion in terms of the nucleon's momentum inside nuclear matter of the current for isobar electro-excitation from the nucleon is performed. Being exact with respect to the transferred energy and momentum, this yields new current operators which retain important aspects of relativity not taken into account in the traditional non-relativistic reductions. The transition current thus obtained differs from the leading order of the traditional expansion by simple multiplicative factors. These depend on the momentum and energy transfer and can be easily included together with relativistic kinematics in non-relativistic, many-body models of isobar electro-excitation in nuclei. The merits of the new current are tested by comparing with the unexpanded electromagnetic nuclear responses in the isobar peak computed in a relativistic Fermi gas framework. The sensitivity of the relativistic responses to the isobar's magnetic, electric and Coulomb form factors and the finite width of the isobar is analyzed.
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"abstract": "A new non-relativistic expansion in terms of the nucleon\u0027s momentum inside\nnuclear matter of the current for isobar electro-excitation from the nucleon is\nperformed. Being exact with respect to the transferred energy and momentum,\nthis yields new current operators which retain important aspects of relativity\nnot taken into account in the traditional non-relativistic reductions. The\ntransition current thus obtained differs from the leading order of the\ntraditional expansion by simple multiplicative factors. These depend on the\nmomentum and energy transfer and can be easily included together with\nrelativistic kinematics in non-relativistic, many-body models of isobar\nelectro-excitation in nuclei. The merits of the new current are tested by\ncomparing with the unexpanded electromagnetic nuclear responses in the isobar\npeak computed in a relativistic Fermi gas framework. The sensitivity of the\nrelativistic responses to the isobar\u0027s magnetic, electric and Coulomb form\nfactors and the finite width of the isobar is analyzed.",
"arxiv_id": "nucl-th/9905035",
"authors": [
"J. E. Amaro",
"M. B. Barbaro",
"J. A. Caballero",
"T. W. Donnelly",
"A. Molinari"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/S0375-9474(99)00334-6",
"journal_ref": "Nucl.Phys.A657:161-186,1999",
"title": "Relativistic effects in electromagnetic nuclear responses in the quasi-elastic delta region",
"url": "https://arxiv.org/abs/nucl-th/9905035"
},
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