Program - Brookhaven National Laboratory

evaluation (including covariances) of the full Pu isotopic line ( 238−242 Pu) using differential and integral
constrains is performed to build weighted samplings of the model parameters, differential observables, and
integral observables, which can then be analyzed in terms of optimal solution, and covariances matrices.
The method and its application to the Pu isotopic line will be presented.
[1] A. Koning, S. Hilaire, M. Duijvestijn, Proc. Inern. Conf. on Nuclear Data for Science and Technology,
Nice France 2007, p. 1329 (EDP Sciences, Paris, 2009). [2] D. Rochman, A. Koning, S, Van de Mark, Ann.
Nucl. Energy, vol 36, p. 810 (2009) and D. Rochman, A. Koning, S, Van de Mark, Fusion Engineering
and Design vol 85, p. 669 (2010). [3] E. Bauge, P. Dossantos-Uzarralde, Journal of the Korean Physical
Society, vol 30, p 1218 (2011).
MA 2 9:15 AM
Exploring new neutron-rich nuclei with the Facility for Rare Isotope Beams
Michael Thoennessen
National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing MI 48824
About 100 years after Rutherford discovered the atomic nucleus the limits of what combinations of protons
and neutrons can make up a nucleus are still only known for the lightest elements. Exploring the nuclear
landscape and pushing towards the limits of nuclear existence is important for the understanding of the
strong force and the element formation in the universe. The discovery of new isotopes is the first step in
the study of the properties of the most exotic nuclei. Estimates indicate that the Facility for Rare Isotope
Beams, FRIB, could produce 1000 new isotopes and allow the detailed study of nearly 4500 isotopes. An
overview of the discovery of nuclides and the projected capabilities of FRIB will be presented.
Session NA Neutron Cross Section Measurements
Thursday March 7, 2013
Room: Met East at 10:30 AM
NA 1 10:30 AM
Capture Cross-section Measurement of 241 Am at J-PARC/MLF/ANNRI
H. Harada, M. Ohta, A. Kimura, K. Furutaka, S. Goko, K. Hirose, K. Y. Hara, T. Kin, F. Kitatani, M.
Koizumi, S. Nakamura, M. Oshima, Y. Toh
Japan Atomic Energy Agency
M. Igashira, T. Katabuchi, M. Mizumoto
Tokyo Institute of Technology
K. Kino, Y. Kiyanagi
Hokkaido University
T. Fujii, S. Fukutani, J. Hori, K. Takamiya
Kyoto University
Accurate determination of the neutron capture cross sections of radioactive nuclei is required in the fields of
nuclear waste transmutation study and also nuclear astrophysics. The accurate neutron-nucleus reaction
measurement instrument (ANNRI), which was installed in the materials and life science experimental
facility (MLF) at the J-PARC, is expected to satisfy these demands. The capture cross section of 241 Am
was measured using a high efficiency Ge spectrometer installed in the ANNRI. By taking advantage of its
high gamma-ray energy resolution, background components were precisely subtracted. The capture cross
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