Erlangen 2026 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 4: Structure and Dynamics of Nuclei I
HK 4.5: Vortrag
Montag, 16. März 2026, 17:45–18:00, AM 00.011
Lifetime Measurements Excited States in 99Pd — •Ramona Burggraf, Peter Reiter, Rainer Abels, Timo Biesenbach, Andrey Blazhev, Maximilian Droste, Arwin Esmaylzadeh, Christoph Fransen, Kai Henseler, Hannah Kleis, Mario Ley, Aaron Pfeil, Joe Roob, Alessandro Salice, Timon Sültenfuß, and David Werner — IKP, Universität zu Köln
Excited states in 99Pd were populated in the 90Zr(12C,3n) fusion-evaporation reaction at a beam energy of 55 MeV using the Cologne plunger setup in combination with the CATHEDRAL γ-ray spectrometer, which consists of 24 HPGe and eight LaBr3 detectors. The setup enabled simultaneous recoil-distance Doppler-shift and fast-timing measurements. The lifetimes of the first excited state and several previously unknown higher-lying levels were extracted using the differential decay-curve method. Longer-lived states were additionally characterised using γ-γ fast timing. Transitional nuclei located south-east of the doubly magic 100Sn have long been considered as prototypical vibrational systems, although recent lifetime data have questioned this interpretation [1]. For 99Pd, however, experimental information on excited states remains scarce. Prior to the present work, only a single lifetime had been reported by Ivanova et al. [2], which disagreed with the results obtained in this study. The new set of level lifetimes, including those for higher-lying states, will be presented and compared with large-scale shell-model calculations.
[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; Fast-timing; Nuclear structure