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HK: Fachverband Physik der Hadronen und Kerne

HK 37: Instrumentation IX

HK 37.1: Gruppenbericht

Mittwoch, 16. März 2016, 14:00–14:30, S1/01 A3

New developments of the Recoil Distance Doppler-Shift method — •Christoph Fransen, Andrey Blazhev, Thomas Braunroth, Alfred Dewald, Alina Goldkuhle, Jan Jolie, Julia Litzinger, Claus Mueller-Gatermann, Dorothea Woelk, and Karl-Oskar Zell — Institut für Kernphysik, Universität zu Köln

The recoil distance Doppler-shift (RDDS) method is a very valuable technique for measuring lifetimes of excited nuclear states in the picosecond range to deduce absolute transition strengths between nuclear excitations independent on the reaction mechanism. Dedicated plunger devices were built by our group for measurements with this method for a broad range of beam energies ranging from few MeV/u up to relativistic energies of the order of 100 MeV/u. Those were designed to match the constraints defined by state-of-the art γ-ray spectrometers like AGATA, Galileo, Gammasphere. Here we give an overview about recent experiments of our group to determine transition strengths from level lifetimes in exotic nuclei where also recoil separators or mass spectrographs were used for an identification of the recoiling reaction products. The aim is to learn about phenomena like shape phase coexistence in exotic regions and the evolution of the shell structure far from the valley of stability. We will also review new plunger devices that are developed by our group for future experimental campaigns with stable and radioactive beams in different energy regimes, e.g., a plunger for HIE-ISOLDE. Supported by the BMBF, Grant No. 05P15PKFNA and 05P15PKCIA and the DFG, Grant No. DE 1516/3-1.