Exotic modes of excitation and weak interaction rates at finite temperature

Journal Article · Fri Oct 28 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3628355· OSTI ID:21612117

Paar, N ^[1]

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1. Physics Department, Faculty of Science, University of Zagreb (Croatia)

The interplay of isospin asymmetry and finite temperature in nuclei plays an important role on properties of nuclear excitations and weak interaction rates in stellar environment. Recently a fully self-consistent microscopic framework, based on Hartree-Fock plus random phase approximation using Skyrme functionals, has been introduced for description of excitations and weak-interaction cross sections at finite temperature. Another self-consistent framework involving nuclei at finite temperature has also been developed within relativistic mean field theory using effective Lagrangians with density dependent meson-nucleon vertex functions. Nuclear excitations are studied using finite temperature random phase approximation for the range of temperatures T = 0-2 MeV, as well as in nuclei far from stability. In the focus of research are the structure properties of exotic modes of excitation (e.g. pygmy dipole resonances) and charge-exchange modes (e.g. Gamow-Teller resonances and forbidden transitions). It is shown that finite temperature effects include novel low-energy multipole excitations and modifications of the Gamow-Teller transition spectra. Using a representative set of Skyrme functionals, as well as covariant energy density functional with DD-ME2 parameterization, both theory frameworks have been applied in calculations of electron-capture cross sections relevant in the stage of supernova precollapse.

• OSTI ID: 21612117
• Journal Information: AIP Conference Proceedings, Vol. 1377, Issue 1; Conference: FINUSTAR 3 Conference on frontiers in nuclear structure, astrophysics, and reactions, Rhodes (Greece), 23-27 Aug 2010; Other Information: DOI: 10.1063/1.3628355; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGE EXCHANGE
CROSS SECTIONS
ELECTRON CAPTURE
EXCITATION
FORBIDDEN TRANSITIONS
GAMOW-TELLER RULES
HARTREE-FOCK METHOD
ISOSPIN
LAGRANGIAN FIELD THEORY
LAGRANGIAN FUNCTION
MEAN-FIELD THEORY
NUCLEI
NUCLEONS
RANDOM PHASE APPROXIMATION
RELATIVISTIC RANGE
SKYRME POTENTIAL
SPIN
TEMPERATURE DEPENDENCE
VERTEX FUNCTIONS
WEAK INTERACTIONS
ANGULAR MOMENTUM
APPROXIMATIONS
BARYONS
BASIC INTERACTIONS
CALCULATION METHODS
CAPTURE
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
FERMIONS
FIELD THEORIES
FUNCTIONS
HADRONS
INTERACTIONS
NUCLEON-NUCLEON POTENTIAL
PARTICLE PROPERTIES
POTENTIALS
QUANTUM FIELD THEORY