Abstract
An evaluation of fast neutron induced reactions on 235U is performed in the 2.25 keV-30 MeV incident energy range with the code EMPIRE-3.2 Malta, combined with selected experimental data. The reaction model includes a dispersive optical model potential (RIPL 2408) that couples seven levels of the ground-state rotational band and a triple-humped fission barrier with absorption in the wells described within the optical model for fission. EGSM nuclear level densities are used in Hauser-Feshbach calculations of the compound-nuclear decay. The starting values for the model parameters are retrieved from the RIPL-3 data-base. Excellent agreement is achieved with available experimental data for neutron emission, neutron capture and fission, which gives confidence that the quantities for which there is no experimental information are also predicted accurately. In the fast neutron region of the evaluated file, the fission cross section is taken from Neutron Standards, and neutron capture includes fluctuations observed in recent experiments. Other channels are taken directly from model calculations. New evaluation is validated against ICSBEP criticality benchmarks with fast neutron spectra with excellent results.
Original language | English |
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Title of host publication | ND 2016 |
Subtitle of host publication | International Conference on Nuclear Data for Science and Technology |
Editors | Peter Siegler, Wim Mondelaers, Arjan Plompen, Franz-Josef Hambsch, Peter Schillebeeckx, Stefan Kopecky, Jan Heyse, Stephan Oberstedt |
Publisher | EDP Sciences |
ISBN (Electronic) | 9782759890200 |
DOIs | |
State | Published - Sep 13 2017 |
Event | 2016 International Conference on Nuclear Data for Science and Technology, ND 2016 - Bruges, Belgium Duration: Sep 11 2016 → Sep 16 2016 |
Publication series
Name | EPJ Web of Conferences |
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Volume | 146 |
ISSN (Print) | 2101-6275 |
ISSN (Electronic) | 2100-014X |
Conference
Conference | 2016 International Conference on Nuclear Data for Science and Technology, ND 2016 |
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Country/Territory | Belgium |
City | Bruges |
Period | 09/11/16 → 09/16/16 |
Funding
The work of M.S. was partially supported by the European Commission under the contract CHANDA (EURATOM No. FP7-605203). R.C. would also like to thanks his optical model coworkers J.M. Quesada and S. Chiba. Authors acknowledge an important contribution made by the IAEA Neutron Standard committee, and by all contributors to the IAEA Prompt Fission Neutron Spectra project. Special thanks to M.B. Chadwick, M. White, T. Kawano and P. Talou for many enlightening discussions, and to A.C. (Skip) Kahler for the enormous number of calculated benchmark results for crosschecking and validation.