dorsal/arxiv
View SchemaMicroscopic calculations of double and triple Giant Resonance excitation in heavy ion collisions
| Authors | E. G. Lanza, F. Catara, M. V. Andres, Ph. Chomaz, M. Fallot, J. A. Scarpaci |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0611079 |
| URL | https://arxiv.org/abs/nucl-th/0611079 |
| DOI | 10.1103/PhysRevC.74.064614 |
| Journal | Phys.Rev.C74:064614,2006 |
Abstract
We perform microscopic calculations of the inelastic cross sections for the double and triple excitation of giant resonances induced by heavy ion probes within a semicalssical coupled channels formalism. The channels are defined as eigenstates of a bosonic quartic Hamiltonian constructed in terms of collective RPA phonons. Therefore, they are superpositions of several multiphonon states, also with different numbers of phonons and the spectrum is anharmonic. The inclusion of (n+1) phonon configurations affects the states whose main component is a n-phonon one and leads to an appreacible lowering of their energies. We check the effects of such further anharmonicities on the previous published results for the cross section for the double excitation of Giant Resonances. We find that the only effect is a shift of the peaks towards lower energies, the double GR cross section being not modified by the explicity inclusion of the three-phonon channels in the dynamical calculations. The latters give an important contribution to the cross section in the triple GR energy region which however is still smaller than the experimental available data. The inclusion of four phonon configurations in the structure calculations does not modify the results.
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"abstract": "We perform microscopic calculations of the inelastic cross sections for the\ndouble and triple excitation of giant resonances induced by heavy ion probes\nwithin a semicalssical coupled channels formalism. The channels are defined as\neigenstates of a bosonic quartic Hamiltonian constructed in terms of collective\nRPA phonons. Therefore, they are superpositions of several multiphonon states,\nalso with different numbers of phonons and the spectrum is anharmonic. The\ninclusion of (n+1) phonon configurations affects the states whose main\ncomponent is a n-phonon one and leads to an appreacible lowering of their\nenergies. We check the effects of such further anharmonicities on the previous\npublished results for the cross section for the double excitation of Giant\nResonances. We find that the only effect is a shift of the peaks towards lower\nenergies, the double GR cross section being not modified by the explicity\ninclusion of the three-phonon channels in the dynamical calculations. The\nlatters give an important contribution to the cross section in the triple GR\nenergy region which however is still smaller than the experimental available\ndata. The inclusion of four phonon configurations in the structure calculations\ndoes not modify the results.",
"arxiv_id": "nucl-th/0611079",
"authors": [
"E. G. Lanza",
"F. Catara",
"M. V. Andres",
"Ph. Chomaz",
"M. Fallot",
"J. A. Scarpaci"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.74.064614",
"journal_ref": "Phys.Rev.C74:064614,2006",
"title": "Microscopic calculations of double and triple Giant Resonance excitation in heavy ion collisions",
"url": "https://arxiv.org/abs/nucl-th/0611079"
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