Bonn 2010 – wissenschaftliches Programm
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 Nair1,3, 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.