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HK: Fachverband Physik der Hadronen und Kerne

HK 20: Struktur und Dynamik von Kernen

HK 20.4: Talk

Monday, March 4, 2013, 17:45–18:00, HSZ-401

New modes of nuclear excitations in microscopic and collective model description — •Nadia Tsoneva^1,2 and Horst Lenske¹ — ¹Institut für Theoretische Physik, Universität Gießen — ²INRNE, BAS, Sofia, Bulgaria

A microscopic approach based on density functional theory and multi-phonon QRPA methods is successfully applied for investigations of pygmy resonances and other excitations of different multipolarities and energies in stable and exotic nuclei. From systematic studies of nuclear response functions a clear indication of close connection between low-energy excited states related to pygmy resonances and nuclear skin oscillations is observed. This is confirmed also in analyses of transition densities and currents. A useful link to collective model approaches is used for distinction of pygmy resonance from other modes of excitations related low-energy multi-phonon vibrations, twist modes or giant resonances observed in response functions and data. Furthermore, nuclear skins are found to affect M1 strength distributions in nuclei, as confirmed by recent experiments. The fine structure of the spin-flip M1 resonance is discussed and compared to experimental data. Supported by BMBF project 06GI9109.