Erlangen 2026 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 39: Structure and Dynamics of Nuclei VIII

HK 39.2: Talk

Thursday, March 19, 2026, 16:30–16:45, AM 00.011

Relative ²³²Th(γ,f) and ²³⁴U(γ,f) Cross-Sections using Quasi-Monoenergetic γ-ray Beams — •Thorben Witzel¹, Dimiter Balabanski⁴, Mihai Cuciuc⁴, Joachim Enders¹, Sean W. Finch², Alf Göök³, Calvin R. Howell², Annabel Ibel¹, Ronald C. Malone⁷, Maximilian Meier¹, Forrest Q.L. Friesen², Andreas Oberstedt⁴, Stephan Oberstedt⁵, Marius Peck¹, Norbert Pietralla¹, Anthony P.D Ramirez⁶, Jack A. Silano⁶, Alexandru State⁴, Gerhart Steinhilber¹, Anton P. Tonchev⁶, Werner Tornow², and Vincent Wende¹ — ¹Institut für Kernphysik, Fachbereich Physik, TU Darmstadt, Darmstadt, Germany — ²Triangle Universities Nuclear Laboratory, Duke University, Durham, NC, USA — ³Uppsala Universitet, Uppsala, Sweden — ⁴ELI-NP, IFIN-HH, Magurele, Romania — ⁵EC-JRC Geel, Belgium — ⁶Lawrence Livermore National Laboratory, Livermore, CA, USA — ⁷U.S. Naval Academy, Annapolis, MD, USA

Precise and reliable data on photofisson cross-sections are essential for modeling of the r-process as well as technical applications of nuclear fission. Although fission cross-sections have been studied for over 80 years, there are still some discrepancies in the nuclear data libraries for some actinides. We analyzed count rates from ionisation chamber experiments using quasi-monochromatic γ-ray beams ranging from 6 to 12.8 MeV, investigating the shape of the cross-sections of ²³²Th(γ,f) and ²³⁴U(γ,f) using ²³⁸U(γ,f) as a well known reference.
*This work is supported by the Deutsche Forschungsgemeinschaft (DFG) Project-ID 499256822 GRK 2891 Nuclear Photonics.

Keywords: fission; actinide; cross-section; photon-induced