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HK: Fachverband Physik der Hadronen und Kerne

HK 16: Instrumentation III

HK 16.5: Vortrag

Dienstag, 12. März 2024, 17:00–17:15, HBR 19: C 1

The new Cologne CATHEDRAL spectrometer for nuclear lifetime measurements — •Christoph Fransen, Andrey Blazhev, Felix Dunkel, Arwin Esmaylzadeh, Jan Jolie, Lukas Knafla, Casper-David Lakenbrink, Mario Ley, Richard Novak, Stefan Thiel, Franziskus von Spee, Nigel Warr, and Michael Weinert — Institute for Nuclear Physics, University of Cologne, Germany

A new spectrometer for simultaneous lifetime measurements with Doppler-shift techniques, especially with the recoil-distance Doppler-shift (RDDS) technique, and the fast-timing method was developed for the Cologne FN Tandem accelerator facility. The high γ-ray efficiency and very compact geometry of the new setup in combination with different charged-particle detector arrays allows to investigate weak reaction channels using particle-γ-γ coincidences. This is crucial both for precise fast-timing measurements and RDDS experiments. Especially for the latter, an advantage can be drawn from the gain in efficiency as with the use of γ-γ coincidence analysis methods [1] any need for assumptions on feeding conditions can be avoided. In particular, the new spectrometer is designed for transfer reactions, but can be also used with other experimental probes, e.g., fusion-evaporation and Coulomb excitation. We will present the results of a commissioning experiment demonstrating the high capabilities of the new setup and show an overview of first experiments.

[1] A. Dewald et al., Prog. Part. Nucl. Phys. 67, (2012) 786

Keywords: nuclear lifetime measurements; gamma-ray spectrometer; Doppler-shift techniques; fast timing method