{"paper":{"title":"Extension of the Random Phase Approximation including the self-consistent coupling to two-phonon contributions","license":"","headline":"","cross_cats":[],"primary_cat":"nucl-th","authors_text":"C.Barbieri (TRIUMF, St.Louis), Vancouver), W.H.Dickhoff (Wash. Univ.","submitted_at":"2002-12-04T23:00:26Z","abstract_excerpt":"A microscopic formalism is developed that includes the coupling to two particle-hole phonons in the particle-hole propagator by extending the dressed random phase approximation (DRPA) equation for a finite system.\n The resulting formalism is applied to study the low-lying excitation spectrum of 16O.\n It is observed that the coupling to two-phonon states at low energy generates excited states with quantum numbers that cannot be obtained in the DRPA approach.\n Nevertheless, the two-phonon states mix weakly with particle-hole configurations and participate only partially in the formation of the l"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-th/0212025","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}