SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 50: Structure and Dynamics of Nuclei X
HK 50.3: Vortrag
Mittwoch, 22. März 2023, 18:15–18:30, SCH/A215
Self-absorption experiments with quasi-monochromatic photon beams: A new approach to nuclear level densities — •J. Isaak1, D. Savran2, A.D. Ayangeakaa3,4, M. Beuschlein1, S.W. Finch4,5, A. Gupta1, D. Gribble3,4, J. Hauf1, R.V.F. Janssens3,4, S.R. Johnson3,4, P. Koseoglou1, T. Kowalewski3,4, B. Löher2, O. Papst1, N. Pietralla1, A. Saracino3,4, N. Sensharma3,4, and V. Werner1 — 1IKP, TU Darmstadt — 2GSI, Darmstadt — 3UNC, Chapel Hill, NC, USA — 4TUNL, Durham, NC, USA — 5Duke U., Durham, NC, USA
The modeling of the elemental abundances in the universe requires, among others, information on the nuclear level density (NLD) of isotopes across the nuclear chart from stable to unstable nuclides. While it can be determined at the lowest excitation energies and from neutron resonances, it is a difficult quantity to access at intermediate excitation energies. In fall 2022, a pioneering experiment with 88Sr was performed at HIγS exploiting the combination of the self-absorption technique with quasi-monoenergetic photon beams. A novel approach is introduced enabling the extraction of the NLD of dipole-excited states with photonuclear reactions and first results for the case of 88Sr are presented.
Supported by the State of Hesse, grant "Nuclear Photonics" (LOEWE program) and the Research Cluster ELEMENTS (Project-ID 500/10.006),
the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation - Project-ID 279384907 - SFB 1245 and the U. S. DOE Grant No. DE-FG02-97ER41041 and No. DE-FG02-97ER41033.