Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 56: Struktur und Dynamik von Kernen IX

HK 56.8: Vortrag

Donnerstag, 18. März 2010, 18:45–19:00, HG VII

Enhancement of dipole strength below the neutron-separation energy in 139LaA. Makinaga1, G. Rusev2,3, •R. Schwengner2, F. Doenau2, D. Bemmerer2, R. Beyer2, P. Crespo2,4, M. Erhard2,5, A.R. Junghans2, J. Klug2,6, K. Kosev2, C. Nair2,7, K.D. Schilling2, and A. Wagner21Hokkaido University, Sapporo, 060-0810, Japan — 2Forschungszentrum Dresden-Rossendorf, 01314 Dresden, Germany — 3Duke University and TUNL, Durham, NC 27708, USA — 4University of Coimbra, 3004-516 Coimbra, Portugal — 5INFN, Sezione di Padova, 35131 Padova, Italy — 6Vattenfall Power Consultant, 16216 Stockholm, Sweden — 7Argonne National Laboratory, Argonne, IL 60439, USA

The photoabsorption cross section of 139La was measured up to the neutron-separation energy using bremsstrahlung produced at the electron accelerator ELBE of the Forschungszentrum Dresden-Rossendorf with a beam of 11.5 MeV kinetic energy. To estimate branching ratios of transitions from states in the quasicontinuum, we performed simulations of γ-ray cascades. The photoabsorption cross section deduced from the resulting intensities of the ground-state transitions can be combined with photoneutron cross sections to obtain data in a wide energy range up to the giant dipole resonance (GDR). We observe an enhancement of electric dipole strength relative to a Lorentz-like tail of the GDR that cannot be quantitatively reproduced by current model calculations.

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