Program - Brookhaven National Laboratory

Book of Abstracts
Session AA ND2013 Opening talk and Monday Plenary
Monday March 4, 2013
Room: Met East at 8:30 AM
AA 1 8:30 AM Opening Talk
CIELO, A Future Collaborative International Evaluated Library
M.B. Chadwick, T. Kawano
Los Alamos National Laboratory
M.W. Herman, B. Pritychenko, et al.
Brookhaven National Laboratory
E.Bauge
CEA/DIF, Bruyeres-le-Chatel, France
R. Capote, R. Forrest
IAEA, Vienna
This talk and paper presents considerations by the international community on the benefits to developing
a worldwide evaluated nuclear database CIELO, which could be achieved through a collaborative effort
comprised of subject matter experts from across the various evaluation projects. For over a year there has
been discussion on this topic amongst leaders participating within the NEA/WPEC and IAEA nuclear data
meetings. CIELO is envisaged as initially a collaborative effort amongst evaluators, eventually becoming
the world’s most accurate recommended nuclear reaction data resource, benefiting from the broad capabilities
in different areas of nuclear reaction physics and computation across the world. To create such a
capability will be a major challenge for the participating countries, requiring collaboration and peer review
at an unprecedented level. The presentation will first summarize some of the main advantages behind this
idea. These include: (1) A goal of a better, more accurate, product, as compared to the existing evaluated
databases; (2)A database that benefits from the ”peer review” coming from the engagement of specialized
teams comprised of subject matter experts; (3) A way to pool resources in technical areas where countries
may be loosing capabilities to retirement; (4) An endorsement of the concept that the evaluated data
aim to reflect our best understanding of physical reality - there is only one correct answer! At the May
2012 WPEC meeting there was an agreement amongst participating projects to initiate a ”pilot project”,
where various members from the evaluation projects will work in 2012, 2013 to identify the main areas of
discrepancy amongst the existing evaluated databases (ENDF, JEFF, JENDL, BRONDL, CENDL, etc),
and amongst the measured data, for a set of 20-30 key - most important - isotopes. In this talk and paper
we will document our findings. This set of documented nuclear data discrepancies will highlight future
collaborative work that will be needed to advance our understanding, and to facilitate the possibility of a
future CIELO. Furthermore, the experience we have over the next 1-2 years will provide valuable lessons to
guide development of a collaboration model - and governance model - for a future CIELO. To be specific,
we will describe the current level of agreement/disagreement between fission (cross sections and prompt
neutron spectra), inelastic and elastic scattering, capture, and (n,2n) reactions for certain key isotopes,
that will include 235,238U, 239Pu, 56Fe, 16O, and 1H. We will highlight the origin of such differences:
experimental data, model calculations, etc. And we will suggest how teams of subject matter experts could
more rapidly advance our understanding of these cross sections and start to resolve discrepancies. We note
that we expect the final author list for this paper will include all who contribute, include many from the
ENDF, JEFF, JENDL, BROND, and CENDL, projects.
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