Program - Brookhaven National Laboratory

PR 64
Nuclear Data Measurements at VERA for Fusion, ADS and Environmental Applications
A. Wallner, VERA Laboratory, Faculty of Physics, University of Vienna, Währinger Strasse 17, A-1090
Vienna, Austria and Department of Nuclear Physics, Australian National University, Canberra, ACT
0200, Australia. K. Buczak, O. Forstner, R. Golser, W. Kutschera, C. Lederer, A. Priller, P. Steier,
VERA Laboratory, Faculty of Physics, University of Vienna, Währinger Strasse 17, A-1090 Vienna,
Austria. A. Klix, Karlsruhe Institute of Technology (KIT), Campus Nord, Institut für Kernphysik,
Karlsruhe, Germany and. A. Krasa, A. Plompen, European Commission, Joint Research Centre,
Institute for Reference Materials and Measurements, Geel, Belgium. D. Schumann, Paul Scherrer
Institute, 5232 Villigen PSI, Switzerland. V. Semkova, NAPC Nuclear Data Section, International
Atomic Energy Agency, A-1400 Vienna, Austria.
Accurate cross sections are the backbones for calculating the production of long-lived radionuclides, which
are of interest in a variety of fields. We summarize some recent cross-section measurements using Accelerator
Mass Spectrometry (AMS) for counting long-lived radionuclides. Data presented here relate to
nuclear fusion and advanced reactor concepts but also to the production of cosmogenic radionuclides for
environmental and geological applications. Lack of information exists for a list of nuclides as pointed
out by nuclear data requests. AMS represents an ultra-sensitive technique for measuring a limited, but
steadily increasing number of longer-lived radionuclides. This method implies a two-step procedure with
sample activation and subsequent AMS measurement. Cross section measurements via neutron activations
in the fast neutron energy range were performed in cooperation with TU Dresden (TUD), utilizing their
neutron generator, i.e. producing 14-MeV neutrons via the (d,t) reaction; and higher energy neutrons were
produced via the Van de Graaff facility at IRMM, Geel, with neutron energies between 13 and 22 MeV.
After activation the AMS measurements were performed at the VERA laboratory. An overview of recent
measurements with reference to the respective application is given and the method is exemplified for some
specific neutron-induced reactions leading to longer-lived nuclides: we will present new precise data for
58 Ni(n,α) and 56 Fe(n,2n), both leading to 55 Fe. A systematic study of 14 C production from 14 N(n,p) and
nat O will be shown. We also continued our studies of 26 Al production in a fusion environment. Finally, new
results obtained for (n,3n) reactions on 70 Ge, 204 Pb and actinides will be compared to model calculations.
PR 65
Processing with LLNL’s New Evaluated Nuclear Data Structure GND and Infrastructure
Fudge
B. R. Beck, G. W. Hedstrom, C. M. Mattoon, Lawrence Livermore National Laboratory.
Lawrence Livermore National Laboratory (LLNL) has made an initial effort towards defining a new structure
for storing evaluated nuclear reaction data called Generalized Nuclear Data (GND). In addition to
the structure, LLNL has developed an infrastructure called Fudge that allows one to modify, visualize
and process (e.g., convert to a form suitable for deterministic transport) data stored in the GND structure.
Additionally, the Fudge infrastructure can convert an ENDF formatted evaluated nuclear data file
to and from GND. By converting an ENDF file to GND and processing we can now compare Fudge’s
processing results to other ENDF processing codes such as NJOY. In this presentation we will describe the
Fudge processing codes, demonstrate how to obtain Fudge and use it to process an ENDF file as well as
show comparisons between the results of Fudge and NJOY processing. This work has been supported by
Department of Energy contract No. DE-AC52-07NA27344 (Lawrence Livermore National Laboratory).
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