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HK: Fachverband Physik der Hadronen und Kerne
HK 14: Structure and Dynamics of Nuclei III
HK 14.2: Talk
Tuesday, March 12, 2024, 16:00–16:15, HBR 14: HS 1
Level densities and γ strength function of 90Zr from the Oslo Method — •Isabelle Brandherm1, Johann Isaak1, Ann-Cecilie Larsen2, Maria Markova1, and Peter von Neumann-Cosel2 — 1Institut für Kernphysik, TU Darmstadt, Germany — 2Department of Physics, University of Oslo, Norway
The Oslo method was developed to determine level densities and γ strength functions (GSF) of nuclei up to the particle separation threshold. Particle-γ coincidence data are used to generate a primary γ-ray matrix, which allows a simultaneous extraction of both observables in an iterative procedure.
In this talk preliminary results on 90Zr are presented. This nucleus is of particular interest, since it allows comprehensive tests of the Brink-Axel hypothesis (similar to [1]) and of the shape method for a model-independent extraction of the GSF [2]. Two experiments were performed at the Oslo Cyclotron laboratory using (p,p’γ) and (α, α′γ) reactions. Particle-γ coincidence data were taken with the Silicon Ring (SiRi) consisting of Δ E − E telescopes and the Oslo Scintillation Array (OSCAR) of large-volume (3"x8") LaBr3:Ce detectors.
[1] M. Markova et al., Phys. Rev. Lett. 127, 182501 (2021).
[2] M. Wiedeking et al., Phys. Rev. C 104, 014311 (2021).
Supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project-ID 279384907 - SFB 1245
Keywords: Level densities; Gamma strength function; Oslo method