Mode Coupling and the Pygmy Dipole Resonance in a Relativistic Two-Phonon Model

Journal Article · Fri Jul 09 00:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.105.022502· OSTI ID:21410903

Litvinova, Elena; Ring, Peter; Tselyaev, Victor ^[1]

---

1. GSI Helmholtzzentrum fuer Schwerionenforschung, 64291 Darmstadt (Germany)

A new class of many-body models, based on covariant density functional theory for excited states, is presented. It allows a parameter free description of the fragmentation of nuclear states induced by mode coupling of two-quasiparticle and two-phonon configurations. As compared to earlier methods it provides a consistent and parameter free theory of the fine structure of nuclear resonances. The method is applied very successfully to investigate the newly discovered low-lying dipole excitations in Sn and Ni isotopes with large neutron excess.

• OSTI ID: 21410903
• Journal Information: Physical Review Letters, Vol. 105, Issue 2; Other Information: DOI: 10.1103/PhysRevLett.105.022502; (c) 2010 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COUPLING
DENSITY FUNCTIONAL METHOD
DIPOLES
EXCITATION
EXCITED STATES
FINE STRUCTURE
FRAGMENTATION
MANY-BODY PROBLEM
NEUTRONS
NICKEL ISOTOPES
PHONONS
RELATIVISTIC RANGE
RESONANCE
TIN ISOTOPES
TWO-BODY PROBLEM
BARYONS
CALCULATION METHODS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
FERMIONS
HADRONS
ISOTOPES
MULTIPOLES
NUCLEONS
QUASI PARTICLES
VARIATIONAL METHODS