dorsal/arxiv
View SchemaRole of anharmonicities and non-linearities in heavy ion collisions. A microscopic approach
| Authors | E. G. Lanza, M. V. Andres, F. Catara, Ph. Chomaz, C. Volpe |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9607052 |
| URL | https://arxiv.org/abs/nucl-th/9607052 |
| DOI | 10.1016/S0375-9474(96)00444-7 |
| Journal | Nucl.Phys. A613 (1997) 445-471 |
Abstract
Using a microscopic approach beyond RPA to treat anharmonicities, we mix two-phonon states among themselves and with one-phonon states. We also introduce non-linear terms in the external field. These non-linear terms and the anharmonicities are not taken into account in the "standard" multiphonon picture. Within this framework we calculate Coulomb excitation of 208Pb and 40Ca by a 208Pb nucleus at 641 and 1000MeV/A. We show with different examples the importance of the non-linearities and anharmonicities for the excitation cross section. We find an increase of 10 % for 208Pb and 20 % for 40Ca of the excitation cross section corresponding to the energy region of the double giant dipole resonance with respect to the "standard" calculation. We also find important effects in the low energy region. The predicted cross section in the DGDR region is found to be rather close to the experimental observation.
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"abstract": "Using a microscopic approach beyond RPA to treat anharmonicities, we mix\ntwo-phonon states among themselves and with one-phonon states. We also\nintroduce non-linear terms in the external field. These non-linear terms and\nthe anharmonicities are not taken into account in the \"standard\" multiphonon\npicture. Within this framework we calculate Coulomb excitation of 208Pb and\n40Ca by a 208Pb nucleus at 641 and 1000MeV/A. We show with different examples\nthe importance of the non-linearities and anharmonicities for the excitation\ncross section. We find an increase of 10 % for 208Pb and 20 % for 40Ca of the\nexcitation cross section corresponding to the energy region of the double giant\ndipole resonance with respect to the \"standard\" calculation. We also find\nimportant effects in the low energy region. The predicted cross section in the\nDGDR region is found to be rather close to the experimental observation.",
"arxiv_id": "nucl-th/9607052",
"authors": [
"E. G. Lanza",
"M. V. Andres",
"F. Catara",
"Ph. Chomaz",
"C. Volpe"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/S0375-9474(96)00444-7",
"journal_ref": "Nucl.Phys. A613 (1997) 445-471",
"title": "Role of anharmonicities and non-linearities in heavy ion collisions. A microscopic approach",
"url": "https://arxiv.org/abs/nucl-th/9607052"
},
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