Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 67: Nukleare Astrophysik

HK 67.1: Gruppenbericht

Donnerstag, 7. März 2013, 14:00–14:30, HSZ-403

New prompt fission γ-ray spectral data and its impact on present evaluated nuclear data files — •Stephan Oberstedt¹, Robert Billnert^1,2, Andreas Oberstedt^2,3, Tamas Belgya⁴, and Trino Martinez⁵ — ¹European Commission, JRC IRMM, B-2400 Geel — ²Fundamental Fysik, CTH, S-41296 Göteborg, Sweden — ³CEA/DAM Île-de-France, F-91297 Arpajon Cedex — ⁴KFKI, H-1121 Budapest 114 — ⁵CIEMAT, E-28040 Madrid

The Generation-IV International Forum (GIF) point out that fast reactors, and modeling their new and innovative cores based on existing data for the most common reactor isotopes ²³⁵U and ²³⁹Pu leads to an intolerable underestimation of the γ-heating, new measurements are required. Therefore, these two isotopes have been included in OECD/NEA’s high priority nuclear data request list for prompt fission γ-ray data; in particular γ-multiplicity and mean energy are requested. Precise knowledge of the prompt γ-ray spectrum is one key to the fundamental understanding of the share of excitation energy between the two fission fragments and the (γ,n) reaction yield in the surrounding matter. With a new detection system, based on lanthanide-halide scintillation detectors, a first validation experiment was performed on the spontaneous fission of ²⁵²Cf.

We will present first results and discuss their impact on evaluated data tables not only for this nuclide, but also for ²³⁸U and ²⁴¹Pu, which is always present in a reactor. Furthermore, we will show preliminary results from our investigation of prompt γ-ray emission from the reaction ²³⁵U(n_th, f), measured at the KFKI in Budapest.