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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Poster
HK 23.18: Poster
Dienstag, 11. März 2025, 17:30–19:00, Foyer Physik
Lifetime measurements of excited states in 99Pd using the recoil-distance Doppler-shift method — •Ramona Burggraf, Peter Reiter, Andrey Blazhev, Maximilian Droste, Arwin Esmaylzadeh, Christoph Fransen, Jan Jolie, Hannah Kleis, Casper-David Lakenbrink, Mario Ley, Franziskus Spee, and Michael Weinert — IKP, Universität zu Köln, Germany
Lifetime studies in Pd isotopes have been performed to test the nuclear structure of transitional nuclei south-east of doubly-magic 100Sn. Nuclei in this region of the nuclear chart have been considered prototypical examples of vibrational nuclei. Recent lifetime measurements have caused doubt about this behaviour for even-even Pd isotopes (e.g. [1]). Information on lifetimes are surprisingly scarce in odd-mass Pd isotopes. The first excited state of 99Pd has been investigated by Ivanova et al. [2], but no lifetimes of higher-lying states are available. Precise lifetime values for excited nuclear states were determined in 99Pd, which was populated in a 90Zr(12C, 3n) fusion-evaporation reaction at a beam energy of 55 MeV at Cologne. The Cologne plunger device was employed, surrounded by the recently commissioned Cologne CATHEDRAL spectrometer, an efficient detector array consisting of 24 HPGe and eight LaBr detectors. The recoil-distance Doppler-shift method was employed and γ-γ coincidence data were analyzed using the differential decay-curve method in order to determine lifetime values. New lifetime results of excited states in 99Pd will be presented.
[1] M. Droste et al., Phys. Rev. C 106, 024329 (2022)
[2] D. Ivanova et al., Phys Rev. C 105, 034337 (2022)
Keywords: Lifetime measurements; RDDS