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HK: Fachverband Physik der Hadronen und Kerne

HK 72: Poster

HK 72.33: Poster

Donnerstag, 14. März 2024, 17:15–18:45, HBR 14: Foyer

Lifetime measurements of excited states in ⁶⁹As — •Sven Wagner, Maximilian Droste, and Peter Reiter — Institut für Kernphysik, Universität zu Köln

Lifetime measurements in ⁶⁹As were motivated by the expected evolution of the shape of this nucleus, from oblate at low spin to triaxial prolate at intermediate spin [1]. Lifetimes and transition strengths values of excited states in ⁶⁹As are not well known yet and independent evaluated results are contradictory. Excited states were populated via the fusion evaporation reaction ⁴⁰Ca(³²S,3p)⁶⁹As at 100 MeV at the FN tandem accelerator at the University of Cologne. The Cologne plunger device, surrounded by an efficient γ-ray detector array comprising 18 HPGe detectors was employed to determine lifetimes with the recoil-distance Doppler-shift method using the differential decay-curve method in coincidence mode. First lifetime values, which deviate from previous results, will be presented.

[1] A. M. Bruce et al., Phys. Rev. C. 62, 027303 (2000)

Keywords: Lifetime measurement; RDDS