Münster 2017 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 61: Structure and Dynamics of Nuclei X
HK 61.8: Vortrag
Freitag, 31. März 2017, 15:45–16:00, F 33
Determination of the fast neutron-induced fission cross section of 242Pu at nELBE — •Toni Kögler1,2, Roland Beyer1, Arnd R. Junghans1, Stefan E. Müller1, and Ralf Nolte3 — 1Helmholtz-Zentrum Dresden-Rossendorf e.V. — 2Technische Universität Dresden — 3Physikalisch-Technische Bundesanstalt Braunschweig
Neutron induced fission cross sections of actinides like the Pu-isotopes are of relevance for the development of nuclear transmutation technologies. For 242Pu current uncertainties are of around 21 %, the target uncertainties in the order of 7 %. Sensitivity studies show that the total uncertainty has to be reduced below 5 %, to allow for reliable neutron physics simulations. This challenging task was performed at the neutron time-of-flight facility nELBE at HZDR, Dresden. Improved experimental conditions and beam power, paired with the right spectral shape of the nELBE neutron source provided excellent conditions to achieve this aim. Within the TRAKULA project, large and homogeneous deposits of 235U and 242Pu have been produced successfully. Using them in two consecutively placed fission chambers allows the determination of the neutron induced fission cross section of 242Pu relative to 235U. Experimental results will be presented and compared to recent experiments and evaluated data. Corrections addressing the neutron scattering are discussed by using results of different neutron transport simulations (Geant 4, MCNP 6 and FLUKA). This work was supported by the EURATOM FP7 project CHANDA and by the German Federal Ministry of Education and Research (03NUK13A).