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. Zilges7 — 1TU 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)