WPEC Subgroup 40 (SG40) - Collaborative International Evaluated Library Organisation (CIELO) Pilot Project

The Collaborative International Evaluated Library Organisation (CIELO) Pilot Project, working under the auspices of the WPEC Subgroup 40 (SG40), was established to generate complete evaluations for a selection of the most important isotopes for parameters in nuclear technologies: U-235, U-238, Pu-239, Fe-56, O-16 and H-1 with the aim of improving the accuracy of the data and resolving previous discrepancies in the overall understanding. The CIELO Pilot Project has been overseeing numerous activities, which recently resulted in an entire special issue of the Nuclear Data Sheets journal (Issue 148, 2018) being dedicated to the subject. It has also led to the production of a suite of new nuclear data evaluations that have been incorporated into major nuclear data libraries. The outcomes of evaluations include significant harmonisation of discrepancies between independent programmes, improvements in the performance of international standard nuclear criticality and neutron transmission benchmarks, complete uncertainties for nearly all parameters and the use of modern data storage technologies. Overall, this work has leveraged considerable, parallel and experimental work in collecting improved experimental measurements to support nuclear data, while highlighting high-priority areas for further study. A productive and durable framework for international evaluation was thus established to build upon lessons learnt. These lessons will continue through new WPEC groups and a new International Atomic Energy Agency (IAEA) evaluation network, which was initiated in response to the success of the NEA CIELO Pilot Project.

Related topics
  • Nuclear science
  • Nuclear data
  • Publications and reports
    CIELO list

    CIELO mailing list for questions, comments or to consult archives

    Phone conferences

    Evaluated files


    External publications

    • Capote, R. et al., "Elastic and inelastic scattering of neutrons on 238U nucleus", EDP Sciences, April 2014, EPJ Web of Conferences, 69, doi: doi.org/10.1051/epjconf/20136900008.
    • Capote, R. et al., "Physics of Neutron Interactions with 238U: New Developments and Challenges", Nuclear Data Sheets, vol. 118, April 2014, Elsevier, pp. 26-31, doi: doi.org/10.1016/j.nds.2014.04.003.
    • Pronyaev, V.G., A.D. Carlson and R. Capote Noy, "Toward a New Evaluation of Neutron Standards", Summary Report of the Technical Meeting held in Vienna, 8-12 July 2013, INDC(NDS)-0641, July 2013, www-nds.iaea.org/publications/indc/indc-nds-0641/.
    • Pritychenko, B., Mughabghab, S.F.,  Sonzogni, A.A., Calculations of Maxwellian-averaged Cross Sections and Astrophysical Reaction Rates Using the ENDF/B-VII.0, JEFF-3.1, JENDL-3.3 and ENDF/B-VI.8 Evaluated Nuclear Reaction Data Libraries, Atomic Data and Nuclear Data Tables 96, 645 (2010), doi: dx.doi.org/10.1016/j.adt.2010.05.002.
    • Pritychenko, B., Mughabghab, S.F., "Neutron Thermal Cross Sections, Westcott Factors, Resonance Integrals, Maxwellian Averaged Cross Sections and Astrophysical Reaction Rates Calculated from the ENDF/B-VII.1, JEFF-3.1.2, JENDL-4.0, ROSFOND-2010, CENDL-3.1 and EAF-2010 Evaluated Data Libraries", Nuclear Data Sheets vol. 113, December 2012, Elsevier, pp. 3120-3144, doi: dx.doi.org/10.1016/j.nds.2012.11.007.


    SG40-CIELO working area (password protected | reminder)


    Michael Fleming