Gießen 2007 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 41: Kernphysik / Spektroskopie
HK 41.3: Talk
Thursday, March 15, 2007, 11:45–12:00, B
Lifetime measurement with the Double Orange Spectrometer — •Jean-Marc Régis1, Tim Meersschaut2, Thomas Materna1, Gheorge Pascovici1, Christoph Fransen1, Alfred Dewald1, Norbert Braun1, and Jan Jolie1 — 1IKP der Universität zu Köln, Zülpicher Str. 77, D-50937 Köln — 2Laboratorium for subatomic and radiation physics, Proeftuinstraat 86, B-9000 Gent, Belgium
The determination of the lifetime of an exited nuclear state has become of great importance in nuclear structure physics. The transition probability, the reciprocal of the lifetime, is dependent on the states (wavefunctions) involved. With the knowledge of the lifetime, theoretical models can be tested.
For the nano- and subnanosecond range a Double Orange Spectrometer has been mounted at the Institute for Nuclear Physics of the University of Cologne. By the delayed coincidence technique, the lifetime is measured via conversion electron e−-e−-coincidences. An important advantage of this method is the elimination of the feeding problem. Test measurements on 193Au were succesfull and the lifetime of the first 2+-state in 176Os was measured with higher accuracy: τ=(0.92± 0.06)ns.