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HK: Fachverband Physik der Hadronen und Kerne
HK 14: Structure and Dynamics of Nuclei III
HK 14.4: Talk
Tuesday, March 12, 2024, 16:30–16:45, HBR 14: HS 1
Model-independent test of the Brink-Axel hypothesis — •O. Papst1, J. Isaak1, A. D. Ayangeakaa2,3, T. Beck1,4, S. W. Finch3,5, U. Friman-Gayer3,5,6, D. Gribble2,3, X. James2,3, R. V. F. Janssens2,3, S. R. Johnson2,3, J. Kleemann1, F. Kluwig7, P. Koseoglou1, B. Löher8, M. Müscher7, N. Pietralla1, D. Savran8, V. Werner1, and A. Zilges7 — 1TU Darmstadt — 2UNC, Chapel Hill, NC, USA — 3TUNL, Durham, NC, USA — 4FRIB, MSU, East Lansing, MI, USA — 5Duke University, Durham, NC, USA — 6ESS, Lund, SE — 7University of Cologne — 8GSI, Darmstadt
According to the Brink-Axel hypothesis, the photon strength function (PSF) is independent of the detailed structure of initial and final states, and thus independent of level energies, spins, and parities involved. Upward (excitation) and downward (deexcitation) PSF are thus expected to be the same. However, for 96Mo, significant discrepancies were observed [1] in several experiments. To study the observed discrepancies, we performed an experiment on 96Mo at HIγS using a new method [2] that allows for the simultaneous measurement of upward and downward PSF in a single nuclear resonance fluorescence experiment with γγ coincidences. First results will be discussed.
Supported by the BMBF, grant No. 05P21RDEN9, the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Project-ID 499256822 – GRK 2891, and the U. S. DOE, grant No. DE-FG02-97ER41041, No. DE-FG02-97ER41033, and No. DE-SC0023010.
[1] D. Martin et al., Phys. Rev. Lett. 119, 182503 (2017)
[2] J. Isaak et al., Phys. Lett. B 788, 225 (2019)
Keywords: Photon Strength Function; Nuclear Resonance Fluorescence; Photonuclear Reactions; Statistical Model; γγ coincidences