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SMuK 2023 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 9: Structure and Dynamics of Nuclei I

HK 9.2: Talk

Monday, March 20, 2023, 17:00–17:15, SCH/A118

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. Zilges71TU Darmstadt — 2UNC, Chapel Hill, NC, USA — 3TUNL, Durham, NC, USA — 4FRIB, MSU, East Lansing, MI, USA — 5Duke U., Durham, NC, USA — 6ESS, Lund, SE — 7Univ. Köln — 8GSI, Darmstadt

The Brink-Axel (BA) hypothesis states that the transition probability between two groups of states, described by the photon strength function (PSF) for a given multipolarity, only depends on the energy difference of the states. For 96Mo, significant discrepancies between upward (excitation) and downward (deexcitation) PSF were found [1] with various experimental probes. A new method [2] allows for the simultaneous measurement of upward and downward PSF in a single nuclear resonance fluorescence (NRF) experiment. To test the discrepancies and BA hypothesis, NRF experiments on 96Mo were performed at the High Intensity γ-ray Source (HIγS) and will be discussed.
Supported by the State of Hesse, grant “Nuclear Photonics” (LOEWE program), 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.

[1] D. Martin et al., Phys. Rev. Lett. 119, 182503 (2017)

[2] J. Isaak et al., Phys. Lett. B 788, 225 (2019)

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