Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 54: Nuclear Physics Applications

HK 54.6: Talk

Wednesday, March 18, 2009, 15:45–16:00, H-ZO 100

Approach for uncertainties in nuclear data evaluations based on modelling — •Helmut Leeb — Atominstitut der Österr. Universitäten, TU Wien, Wien, Austria

The design of new nuclear facilities, medical applications and dosimetry require the knowledge of all relevant nuclear cross sections and spectra. With regard to current developments in fusion and fission technologies an extension of nuclear data libraries up to 150 MeV and inclusion of covariance matrices for cross section uncertainties are requested. Because of the scarcity of experimental data beyond 20 MeV this extension is not trivial and the corresponding evaluations rely strongly on modelling. For such theory-based evaluations no well established procedures are available to estimate reliably the uncertainties. In this contribution we revisit currently studied methods and present a recently formulated evaluation procedure which is built upon fundamental Bayesian statistics. The feasibility and reliability of the method is successfully demonstrated for several isotopes. The work supported by the European Commission under the Contract of Association between EURATOM and the Austrian Academy of Sciences, was carried out within the framework of the European Fusion Development Agreement (EFDA). The views and opinions expressed herein do not reflect necessarily those of the European Commision.