Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 51: Structure and Dynamics of Nuclei X
HK 51.7: Vortrag
Donnerstag, 17. März 2016, 15:30–15:45, S1/01 A03
Investigation of dipole strength in 156Gd up to 7.1 MeV — •E. Aciksoz1,2, T. Beck3, J. Beller3, U. Gayer3, L. Mertes3, H. Pai3, N. Pietralla3, P. Ries3, C. Romig3, V. Werner3, M. Zweidinger3, J. Isaak4,5, B. Löher6, D. Savran4,6, J. Silva4,5, and M. Tamkas4,7 — 1Akdeniz University, Department of Physics, 07058 Antalya, Turkey. — 2Nuclear Science Application and Research Center, Akdeniz University, 07058 Antalya, Turkey. — 3Institut fur Kernphysik, Technische Universitat Darmstadt, 64289 Darmstadt. — 4ExtreMe Matter Institute EMMI, GSI, Darmstadt. — 5Frankfurt Institute for Advanced Studies FIAS, Frankfurt. — 6GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt. — 7Graduate School of Natural and Applied Sciences, Yildiz Technical University, Istanbul.
Low-lying magnetic and electric dipole strengths, the latter often referred to as the pygmy dipole resonance (PDR), has been investigated in the nucleus 156Gd using the Nuclear Resonance Fluorescence (NRF) technique up to a bremsstrahlung endpoint of 7.1 MeV. The experiment was performed at the S−DALINAC using an unpolarized and continuous spectrum of bremsstrahlung photons. The fragmentation of dipole strength was found to be high. Nevertheless, NRF cross sections were determined for the strongest excitations that may be attributed to the PDR. Some of these states have been observed in an (γ,γ′) experiment for the first time in 156Gd. The results achieved from 156Gd(γ,γ′) experiment will be presented and discussed.