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HK: Fachverband Physik der Hadronen und Kerne
HK 36: Kernphysik / Spektroskopie
HK 36.4: Vortrag
Mittwoch, 14. März 2007, 17:45–18:00, D
Lifetime measurements using radioactive ion beams at intermediate energies and the Doppler shift method — •Alfred Dewald1, Barbara Melon1, Thomas Pissulla1, Wolfram Rother1, Christoph Fransen1, Oliver Möller1, Karl-Oskar Zell1, Jan Jolie1, Pavel Petkov2, Krzysztof Starosta3, Adrich Przemyslaw3, David Miller3, Aaron Chester3, Constantin Vaman3, Philip Voss3, Alexandra Gade3, Thomas Glasmacher3, Andreas Stolz3, Daniel Bazin3, and Dirk Weißhaar3 — 1IKP, Universität zu Köln, Köln, Germany — 2Bulg. Acad. of Science, INRNE, Solfia, Bulgaria — 3NSCL, MSU, East Lansing, USA
Absolute transition probabilities are crucial quantities in nuclear structure physics. Therefore, it is important to establish Doppler shift (plunger) techniques also for the measurement of level lifetimes in radioactive ion beam experiments. After a first successful test of the Doppler Shift technique at intermediate energy (52MeV/u) with a stable 124Xe beam, a plunger has been built and used in two experiments, performed at the NSCL/MSU with the SEGA Ge-array and the S800 spectrometer. The aim of the first experiment was to investigate the plunger technique after a knock-out reaction using a radioactive 65Ge beam at 100 MeV/u for populating excited states in 64Ge. The second experiment aimed to measure the lifetimes of the first 2+ states in 110,114Pd with the plunger technique after Coulomb excitation at beam energies of 54 MeV/u. First results of both experiments will be presented and discussed. Supported by : GSI, F.u.E. contract no. OK/JOL