Pygmy Dipol Resonances as a Manifestation of the Structure of the Neutron-Rich Nuclei

Details Pygmy Dipol Resonances as a Manifestation of the Structure of the Neutron-Rich Nuclei Pygmy Dipol Resonances as a Manifestation of the Structure of the Neutron-Rich Nuclei

2003-07-21

arxiv.org/abs/nucl-th/0307081v1

Nucl.Phys. A731 (2004) 273-280

Physics

Nuclear Physics

Nuclear Theory

8 pages, 3 figures, Proceedings of the International Conference on Collective Motion in Nuclei Under Extreme Conditions (COMEX

Scientific paper

Dipole excitations in neutron-rich nuclei below the neutron threshold are investigated. The method is based on Hartree-Fock-Bogoliubov (HFB) and Quasiparticle-Phonon Model (QPM) theory. Of our special interest are the properties of the low-lying 1- Pygmy Resonance and the two-phonon quadrupole-octupole 1- states in Sn-isotopes including exploratory investigations for the experimentally unknown mass regions. In particular we investigate the evolution of the dipole strength function with the neutron excess. The use of HFB mean-field potentials and s.p. energies is found to provide a reliable extrapolation into the region off stability.

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