Microscopic calculations of double and triple Giant Resonance excitation in heavy ion collisions
| Autor: | Ph. Chomaz, J.A. Scarpaci, E. G. Lanza, M.V. Andrés, M. Fallot, F. Catara |
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| Přispěvatelé: | Istituto Nazionale di Fisica Nucleare, Sezione di Catania (INFN), Università degli studi di Catania [Catania], Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Università degli studi di Catania = University of Catania (Unict), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
Nuclear and High Energy Physics
nuclear vibrational states Nuclear Theory [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] Phonon nuclear energy level transitions FOS: Physical sciences Semiclassical physics Coulomb excitation 01 natural sciences Nuclear Theory (nucl-th) symbols.namesake RPA calculations 0103 physical sciences 010306 general physics nuclear collective model Physics 010308 nuclear & particles physics Anharmonicity Giant resonance symbols giant resonances heavy ion-nucleus reactions Atomic physics Random phase approximation Hamiltonian (quantum mechanics) Excitation |
| Zdroj: | Physical Review C Physical Review C, American Physical Society, 2006, 74, pp.064614. ⟨10.1103/PhysRevC.74.064614⟩ Physical Review C, 2006, 74, pp.064614. ⟨10.1103/PhysRevC.74.064614⟩ idUS. Depósito de Investigación de la Universidad de Sevilla instname |
| ISSN: | 2469-9985 2469-9993 |
| DOI: | 10.1103/PhysRevC.74.064614⟩ |
| Popis: | 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. Comment: Revtex4, to be published in PRC |
| Databáze: | OpenAIRE |
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