Program - Brookhaven National Laboratory

enchmarking, the excitation function measurement and the neuron induced fission yields measurement
carried out in recent years will be introduced. Furthermore, some new facilities and proposed plans (e.g.
A Gamma ray Total Absorption Facility (GTAF) for (n, γ) reaction cross section measurement, the back
streaming white neutron beam for nuclear data measurement at China Spallation Neutron Source (CSNS))
for nuclear data measurement will also be presented. These projects are carried out to feed the needs for
nuclear energy development (new generation of nuclear reactors, ADS, etc) and nuclear data evaluation in
China.
OF 2 2:00 PM
Measurements of Inelastic Neutron Scattering from Carbon, Iron, Yttrium and Lead at 96
MeV
C. Gustavsson, C. Hellesen, S. Pomp
Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden
A. Ohrn
Westinghouse, Väster˚as, Sweden
J. Blomgren
Vattenfall AB, Stockholm, Sweden
Inelastic neutron scattering (n,n’x) is a pre-equilibrium reaction, i.e. an intermediate process between direct
and compound nuclear reactions. The (n,n’x) reaction channel is much weaker than the elastic scattering
(n,n) channel and there are very few data sets reported for inelastic neutron scattering at intermediate
neutron energies (20 - 200 MeV). This work is an effort to provide more experimental data for the (n,n’x)
reaction and was carried out at The Svedberg Laboratory in Uppsala at the quasi-mono-energetic neutron
beam of 96 MeV. Using an extended data analysis of data primarily intended for measuring elastic neutron
scattering only, it was possible to extract information on the inelastic scattering from several nuclei. An
iterative forward-folding technique was applied, in which a physically reasonable trial spectrum was folded
with the response function of the detector system and the output was compared to the experimental data.
As a result, double-differential cross sections and angular distributions of inelastic neutron scattering from
12 C, 56 Fe, 89 Y and 208 Pb were obtained for the angular intervals 28 to 58 degrees for carbon, 26 to 65
degrees for iron and 26 to 52 degrees for yttrium and lead. The data sets cover an excitation energy range
up to 45 MeV. In this paper, the forward-folding procedure including the detector response function is
discussed, and results on double-differential cross sections and angular distributions for inelastic neutron
scattering from 12 C, 56 Fe, 89 Y and 208 Pb are presented. Experimental data are compared to several model
codes as well as existing experimental data for the reactions (n,n’x), (n,p’x) and (p,p’x).
OF 3 2:20 PM
Partial Photoneutron Cross Sections for 207,208 Pb
T. Kondo, H. Utsunomiya, C. Iwamoto, H. Akimune, T. Yamagata, Department of Physics, Konan
University, Okamoto 8-9-1, Higashinada, Kobe 658-8501, Japan. S. Goriely, I. Daoutidis, Institut
d’Astronomie et d’Astrophysique, Universite Libre de Bruxelles, Campus de la Plaine, CP-226, 1050
Brussels, Belgium. H. Toyokawa, National Institute of Advanced Industrial Science and Technology,
Tsukuba 305-8568, Japan. H. Harada, F. Kitatani, Japan Atomic Energy Agency, Tokai-mura, Naka,
Ibaraki 319-1195, Japan. Y.-W. Lui, Cyclotron Institute, Texas A & M University, College Station, Texas
77843, USA. S. Hilaire, CEA, DAM, DIF, F-91297 Arpajon, France. A.J. Koning, Nuclear Research and
Consultancy Group, P.O. Box 25, NL-1755 ZG Petten, The Netherlands.
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