Article
Relativistic effects in electromagnetic nuclear responses in the quasi-elastic delta region
Author/s | Amaro Soriano, José Enrique
Barbaro, M. B. Caballero Carretero, Juan Antonio Donnelly, T. W. Molinari, A. |
Department | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Publication Date | 1999-09-20 |
Deposit Date | 2017-09-05 |
Published in |
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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 perfo rmed. Being exact with respect to the transferred energy and ... 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 perfo rmed. 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. |
Funding agencies | Dirección General de Investigación Científica y Técnica (DGICYT). España |
Project ID. | PB95-1204
PB95-0123 PB95-0533-A HI1998-0241 |
Citation | Amaro Soriano, J.E., Barbaro, M.B., Caballero Carretero, J.A., Donnelly, T.W. y Molinari, A. (1999). Relativistic effects in electromagnetic nuclear responses in the quasi-elastic delta region. Nuclear Physics A, 657 (2), 161-186. |
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