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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.