Extended RPA within a solvable 3 level model - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2002

Extended RPA within a solvable 3 level model

Résumé

Working within an exactly solvable 3 level model, we discuss am extension of the Random Phase Approximation (RPA) based on a boson formalism. A boson Hamiltonian is defined via a mapping procedure and its expansion truncated at four-boson terms. RPA-type equations are then constructed and solved iteratively. The new solutions gain in stability with respect to the RPA ones. We perform diagonalizations of the boson Hamiltonian in spaces containing up to four-phonon components. Approximate spectra exhibit an improved quality with increasing the size of these multiphonon spaces. Special attention is addressed to the problem of the anharmonicity of the spectrum.

Dates et versions

hal-00133636 , version 1 (27-02-2007)

Identifiants

Citer

F. Catara, M. Grasso, M. Sambataro. Extended RPA within a solvable 3 level model. 2002. ⟨hal-00133636⟩
62 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More