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HK: Fachverband Physik der Hadronen und Kerne

HK 56: Struktur und Dynamik von Kernen IX

HK 56.7: Vortrag

Donnerstag, 18. März 2010, 18:30–18:45, HG VII

Dipole strength in ¹³⁶Ba up to the neutron-separation energy — •Ralph Massarczyk¹, Ronald Schwengner¹, Roland Beyer¹, Roland Hannaske¹, Arnd Junghans¹, Mathias Kempe¹, Krasimir Kosev¹, Michele Marta¹, Andrija Matic¹, Chithra Nair^1,3, Gencho Rusev², Klaus-Dieter Schilling¹, Daniel Stach¹, Erik Trompler¹, Andreas Wagner¹, and Dmitry Yakorev¹ — ¹Forschungszentrum Dresden-Rossendorf, 01314 Dresden, Germany — ²Duke University and TUNL, Durham, NC 27708, USA — ³Argonne National Laboratory, Argonne, IL 60439, USA

The dipole-strength distribution of ¹³⁶Ba has been investigated at the bremsstrahlung facility at the ELBE accelerator of the Forschungszentrum Dresden-Rossendorf. The photon-scattering experiment was carried out at an electron beam energy of 10.9 MeV in order to study the energy region up to the neutron separation threshold. GEANT4 simulations were performed to subtract the atomic background from the measured spectrum and to deduce the intensity of the resonantly scattered γ-rays. Considering the transitions from states in the quasicontinuum, simulations of γ-ray cascades were carried out to estimate branching ratios. As a result the photoabsorption cross section obtained from transitions to the ground state are combined with existing data from photoneutron experiments.