Toward a consistent random phase approximation based on the relativistic Hartree approximation

Autor:	E. Rost, J. A. McNeil, C.E. Price, J. R. Shepard
Rok vydání:	1992
Předmět:	Physics Nuclear and High Energy Physics Computer Science::Information Retrieval Nuclear Theory Hartree–Fock method Hartree Quantum electrodynamics Quantum mechanics Quasiparticle Cutoff Negative energy Nucleon Ground state Random phase approximation
Zdroj:	Physical Review C. 45:1089-1097
ISSN:	1089-490X 0556-2813
Popis:	We examine the random phase approximation (RPA) based on a relativistic Hartree approximation description for nuclear ground states. This model includes contributions from the negative energy sea at the one-loop level. We emphasize consistency between the treatment of the ground state and the RPA. This consistency is important in the description of low-lying collective levels but less important for the longitudinal ({ital e},{ital e}{prime}) quasielastic response. We also study the effect of imposing a three-momentum cutoff on negative energy sea contributions. A cutoff of twice the nucleon mass improves agreement with observed spin-orbit splittings in nuclei compared to the standard infinite cutoff results, an effect traceable to the fact that imposing the cutoff reduces {ital m}{sup *}/{ital m}. Consistency is much more important than the cutoff in the description of low-lying collective levels. The cutoff model also provides excellent agreement with quasielastic ({ital e},{ital e}{prime}) data.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c3bdb91bc9bffe6760ccde2be002da25 https://doi.org/10.1103/physrevc.45.1089 Zobrazit plný text záznamu