Results of the Collaborative International Evaluated Library Organisation (CIELO) Project

Fleming, M.*; Chadwick, M.*; Brown, D.*; Capote, R.*; Ge, Z.*; Herman, M.*; Ignatyuk, A.*; Ivanova, T.*; Iwamoto, Osamu; Koning, A.*; et al.

EPJ Web of Conferences, 239, p.15003_1 - 15003_5, 2020/09

https://doi.org/10.1051/epjconf/202023915003

CIELO collaboration summary results; International evaluations of neutron reactions on uranium, plutonium, iron, oxygen and hydrogen

Chadwick, M. B.*; Capote, R.*; Trkov, A.*; Herman, M. W.*; Brown, D. A.*; Hale, G. M.*; Kahler, A. C.*; Talou, P.*; Plompen, A. J.*; Schillebeeckx, P.*; et al.

Nuclear Data Sheets, 148, p.189 - 213, 2018/02

https://doi.org/10.1016/j.nds.2018.02.003

The CIELO collaboration has studied neutron cross sections on nuclides that significantly impact criticality in nuclear facilities - U, U, Pu, Fe, O and H - with the aim of improving the accuracy of the data and resolving previous discrepancies in our understanding. This multi-laboratory pilot project, coordinated via the OECD/NEA Working Party on Evaluation Cooperation (WPEC) Subgroup 40 with support also from the IAEA, has motivated experimental and theoretical work and led to suites of new evaluated libraries that accurately reflect measured data and also perform well in integral simulations of criticality. This report summarizes our results and outlines plans for the next phase of this collaboration.

The CIELO Collaboration; Neutron reactions on H, O, Fe, U, and Pu

Chadwick, M. B.*; Dupont, E.*; Bauge, E.*; Blokhin, A.*; Bouland, O.*; Brown, D. A.*; Capote, R.*; Carlson, A. D.*; Danon, Y.*; De Saint Jean, C.*; et al.

Nuclear Data Sheets, 118, p.1 - 25, 2014/04

https://doi.org/10.1016/j.nds.2014.04.002

CIELO (Collaborative International Evaluated Library Organization) provides a new working paradigm to facilitate evaluated nuclear reaction data advances. It brings together experts from across the international nuclear reaction data community to identify and document discrepancies among existing evaluated data libraries, measured data, and model calculation interpretations, and aims to make progress in reconciling these discrepancies to create more accurate ENDF-formatted files. The focus will initially be on a small number of the highest-priority isotopes, namely H, O, Fe, U, and Pu. This paper identifies discrepancies between various evaluations of the highest priority isotopes. The evaluated data for these materials in the existing nuclear data libraries are reviewed, and some integral properties are given. The paper summarizes a program of nuclear science and computational work needed to create the new CIELO nuclear data evaluations.

ENDF/B-VII.1 nuclear data for science and technology; Cross sections, covariances, fission product yields and decay data

Chadwick, M. B.*; Herman, M.*; Obloinsk, P.*; Dunn, M. E.*; Danon, Y.*; Kahler, A. C.*; Smith, D. L.*; Pritychenko, B.*; Arbanas, G.*; Arcilla, R.*; et al.

Nuclear Data Sheets, 112(12), p.2887 - 2996, 2011/12

https://doi.org/10.1016/j.nds.2011.11.002

The ENDF/B-VII.1 library is our latest recommended evaluated nuclear data file for use in nuclear science and technology applications, and incorporates advances made in the five years since the release of ENDF/B-VII.0. These advances focus on neutron cross sections, covariances, fission product yields and decay data, and represent work by the US Cross Section Evaluation Working Group (CSEWG) in nuclear data evaluation that utilizes developments in nuclear theory, modeling, simulation, and experiment. It features extension of covered nuclei, covariance data for 190 nuclei, R-matrix analyses of neutron reactions on light nuclei, updates for some medium-heavy and actinoid nuclei, etc. Criticality benchmark tests with a transport simulation code MCNP shows improved performances.

Review of neutron cross-section evaluations for fission products

Oblozinsk, P.*; Herman, M.*; Mughabghab, S. F.*; Sirakov, I.*; Chang, J.*; Nakagawa, Tsuneo; Shibata, Keiichi; Kawai, Masayoshi*; Ignatyuk, A. V.*; Pronyaev, V. G.*; et al.

AIP Conference Proceedings 769, p.438 - 441, 2005/05

https://doi.org/10.1063/1.1945042

Review of neutron cross-section evaluations for fission products included in 5 major evaluated nuclear-data libralies was performed. The aim of the project, conducted under the WPEC Subgroup 21 during 2001-2004, was to prepare recommendations for best evaluations of nuclei in the range Z=1-68. Altogether, existing evaluations for 211 materials were reviewd, 7 new materials were added, and recommendations were prepared for 218 materials.

Using a 3-D heat transport model (PeCUBE) to invert OSL- and ESR-derived rock cooling histories into erosion rate changes in the Hida Range of Japan

Anderson, L.*; Bartz, M.*; King, G.*; Fox, M.*; Herman, F.*; Stalder, N.*; Biswas, R.*; Sueoka, Shigeru; Tsukamoto, Sumiko*; Ahadi, F.*; et al.

no journal, , 

Unravelling rock cooling histories of the Japanese Alps using trapped-charge thermochronometry

Bartz, M.*; King, G.*; Anderson, L.*; Herman, F.*; Sueoka, Shigeru; Tsukamoto, Sumiko*; Tagami, Takahiro*

no journal, , 

The interaction between rates of Earth surface processes, tectonics and climate is particularly pronounced in high mountain regions. However, understanding the interplay between these variables is complicated, in part due to the difficulties of measuring changes in the rates of Earth surface processes at the timescale of glacial-interglacial cycles. Here we investigate the potential of ultra-low temperature thermochronometers based on the luminescence and electron spin resonance (ESR) of feldspar and quartz minerals respectively for understanding changes in exhumation rates in the Hida range of the Japanese Alps. The Japanese Alps bisect the main island of Honshu, uplifted throughout the Quaternary and reach elevations of up to 3,000 m. The youth of these mountains has made measurement of their exhumation histories challenging and we particularly focus on Tateyama, which was glaciated throughout the late Quaternary period. We collected eight samples and analysed them using both luminescence and ESR thermochronometry. Our results show that whereas the luminescence signals of all samples are either in, or close to their upper dating limit (saturation), the ESR signals have the potential to yield finite exhumation rates for this region. We measured the ESR dose response and thermal decay properties of all samples, specifically targeting the Al and Ti centres. Whilst the Ti signals of some samples are saturated, the Al signals of all samples can be inverted to determine rates of rock cooling. Initial inversions reveal rock cooling rates on the order of 80 deg. C/Ma, far beyond the resolution of the luminescence thermochronometry technique. The next step of our investigation is to invert these data to determine rates of rock exhumation, and to relate these values to the climatic (glacial) and tectonic history of the Tateyama region.

Eustatic change modulates exhumation in the Japanese Alps

King, G. E.*; Ahadi, F.*; Sueoka, Shigeru; Herman, F.*; Anderson, L.*; Gautheron, C.*; Tsukamoto, Sumiko*; Stalder, N.*; Biswas, R.*; Fox, M.*; et al.

no journal, , 

Will ESR thermochronometry reveal the timing of Rhne valley incision?

King, G. E.*; Wen, X.*; Bartz, M.*; Anderson, L.*; Bossin, L.*; Tsukamoto, Sumiko*; Li, Y.*; Herman, F.*; Ogata, Manabu; Sueoka, Shigeru

no journal, , 

Unravelling rock cooling histories of the Japanese Alps within the past 1 Ma using ESR and OSL thermochronometry

Bartz, M.*; King, G. E.*; Herman, F.*; Anderson, L.*; Sueoka, Shigeru; Tsukamoto, Sumiko*; Tagami, Takahiro*

no journal, ,