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Tübingen 2003 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 40: Theorie VI

HK 40.10: Talk

Thursday, March 20, 2003, 15:45–16:00, D

QRPA multi-phonon description of low energy dipole excitations in neutron rich nuclei — •N. Tsoneva1,2, H. Lenske1, and Ch. Stoyanov21Institut für Theoretische Physik, Universität Giessen — 2Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgarien

The properties of the low lying 1 pygmy resonance excitations in neutron rich exotic nuclei are studied by HFB and QRPA theory. Our special emphasis is to investigate the dependence of the fragmentation pattern of the dipole strength function on the neutron excess. As a general result, found e.g. in the tin isotopes, an interesting correlation of the pygmy resonance strength and the size of the neutron skin is obtained. Our calculations confirm previous experimental findings that the lowest 1 strength includes strong quadrupole-octupole two-phonon components. Dipole and other multipole strength distributions are discussed for the Sn and Ni isotopic chains, including exploratory investigations for the experimentally unknown regions. Of particular interest is the influence of the GDR on the B(E1;0+ → 11) and B(E1;31 → 21+) transition probabilities. The use of HFB mean-field potentials and s.p. energies is found to provide a reliable extrapolation into the region far off stability.
Supported in part by DFG grant Le439/5 and European Graduate School Giessen-Copenhagen.

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