Parts | Days | Selection | Search | Updates | Downloads | Help
HK: Fachverband Physik der Hadronen und Kerne
HK 67: Nukleare Astrophysik
HK 67.1: Group Report
Thursday, March 7, 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 Billnert1,2, Andreas Oberstedt2,3, 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(nth, f), measured at the KFKI in Budapest.