Bochum 2009 – wissenschaftliches Programm
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HK: Fachverband Hadronen und Kerne
HK 7: Nuclear Structure and Dynamics II
HK 7.7: Vortrag
Montag, 16. März 2009, 15:45–16:00, H-ZO 50
Relativistic random-phase approximation with density-dependent meson-nucleon couplings at finite temperature — •Yifei Niu1,2, Nils Paar2, Dario Vretenar2, and Jie Meng1 — 1State Key Lab Nucl. Phys. & Tech., School of Physics, Peking University, Beijing 100871, China — 2Physics Department, Faculty of Science, University of Zagreb, Zagreb 10000, Croatia
The fully self-consistent relativistic random-phase approximation (RRPA) framework based on effective interactions with a phenomenological density dependence is extended to finite temperatures. The RRPA configuration space is built from the spectrum of single-nucleon states at finite temperature obtained by the temperature dependent relativistic mean field (RMF-T) theory based on effective Lagrangian with density dependent meson-nucleon vertex functions. As an illustration, the dependence of binding energy, radius, entropy and single particle levels on temperature for spherical nucleus 208Pb is investigated in RMF-T theory. The finite temperature RRPA has been employed in studies of giant monopole and dipole resonances, and the evolution of resonance properties has been studied as a function of temperature. In addition, exotic modes of excitation have been systematically explored at finite temperatures, with an emphasis on the case of pygmy dipole resonances.