dorsal/arxiv
View SchemaMeson-exchange contributions to the nuclear charge operator
| Authors | A. M. Lallena |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9701015 |
| URL | https://arxiv.org/abs/nucl-th/9701015 |
| DOI | 10.1016/S0375-9474(97)00023-7 |
| Journal | Nucl.Phys. A615 (1997) 325-352 |
Abstract
The role of the meson-exchange current correction to the nuclear charge operator is studied in electron scattering processes involving the excitation of medium and heavy nuclei to energies up to the quasi-elastic peak. The effect of these contributions in the quasi-free electron scattering process is a reduction of at most a 3% in the longitudinal response at the energy of the peak, a value which is below the experimental error and must not be taken into account in calculations in this energy region. On the other hand, the excitation of low-lying nuclear levels of neutronic character shows, with respect to the protonic ones, a considerable effect due to the inclusion of the two-body term in the charge operator. More realistic calculations, such as those performed in the random-phase approximation framework, give rise to a mixing of one particle-one hole configurations of both kinds which reduce these effects. However, it has been found that the excitation of some of these levels is sizeably affected by the meson-exchange contribution. More precise experimental data concerning some of these states, such as e.g. the high-spin states in 208Pb, could throw some light in the problem of a more feasible determination of these effects and, as a consequence, could provide an alternative procedure to obtain the charge neutron form factor.
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"abstract": "The role of the meson-exchange current correction to the nuclear charge\noperator is studied in electron scattering processes involving the excitation\nof medium and heavy nuclei to energies up to the quasi-elastic peak. The effect\nof these contributions in the quasi-free electron scattering process is a\nreduction of at most a 3% in the longitudinal response at the energy of the\npeak, a value which is below the experimental error and must not be taken into\naccount in calculations in this energy region. On the other hand, the\nexcitation of low-lying nuclear levels of neutronic character shows, with\nrespect to the protonic ones, a considerable effect due to the inclusion of the\ntwo-body term in the charge operator. More realistic calculations, such as\nthose performed in the random-phase approximation framework, give rise to a\nmixing of one particle-one hole configurations of both kinds which reduce these\neffects. However, it has been found that the excitation of some of these levels\nis sizeably affected by the meson-exchange contribution. More precise\nexperimental data concerning some of these states, such as e.g. the high-spin\nstates in 208Pb, could throw some light in the problem of a more feasible\ndetermination of these effects and, as a consequence, could provide an\nalternative procedure to obtain the charge neutron form factor.",
"arxiv_id": "nucl-th/9701015",
"authors": [
"A. M. Lallena"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/S0375-9474(97)00023-7",
"journal_ref": "Nucl.Phys. A615 (1997) 325-352",
"title": "Meson-exchange contributions to the nuclear charge operator",
"url": "https://arxiv.org/abs/nucl-th/9701015"
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