Collection Citation
| Collection Title | Low-Fidelity Covariances: Neutron Cross Section Covariance Estimates for 387 Materials | ||
| Collection Creator/PI | Low-Fidelity Covariance Project (ANL, BNL, LANL, NNDC, ORNL) | ||
| Collection Sponsor | USDOE - National Nuclear Security Administration (NNSA) | ||
| Other Sponsors | US Nuclear Criticality Safety Program | ||
| DOE Data Center | National Nuclear Data Center (NNDC) | ||
| Host Website | National Nuclear Data Center (NNDC) | ||
| Other Related Organizations | Argonne National Laboratory (ANL); Brookhaven National Laboratory (BNL); Los Alamos National Laboratory (LANL); Oak Ridge National Laboratory (ORNL) | ||
| Main Content Type | Figures/Plots; Numeric Files/Datasets | ||
| Subject Categories | 71 - CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 - PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 - NUCLEAR PHYSICS AND RADIATION PHYSICS; 74 - ATOMIC AND MOLECULAR PHYSICS | ||
| Keywords | Approximations; Cross Sections; Elastic scattering; EV Range; Evaluated Data; Fission; Inelastic Scattering; MEV Range 01-10; MEV Range 10-100; MILLI EV Range; Neutron reactions | ||
| Description | The Low-fidelity Covariance Project (Low-Fi) was funded in FY07-08 by DOE’s Nuclear Criticality Safety Program (NCSP). The project was a collaboration among ANL, BNL, LANL, and ORNL. The motivation for the Low-Fi project stemmed from an imbalance in supply and demand of covariance data. The interest in, and demand for, covariance data has been in a continual uptrend over the past few years. Requirements to understand application-dependent uncertainties in simulated quantities of interest have led to the development of sensitivity / uncertainty and data adjustment software such as TSUNAMI [1] at Oak Ridge. To take full advantage of the capabilities of TSUNAMI requires general availability of covariance data. However, the supply of covariance data has not been able to keep up with the demand. This fact is highlighted by the observation that the recent release of the much-heralded ENDF/BVII. 0 [2] included covariance data for only 26 of the 393 neutron evaluations (which is, in fact, considerably less (which is, in fact, considerably less covariance data than was included in the final ENDF/BVI.[Copied from R.C. Little et al., "Low-Fidelity Covariance Project", Nuclear Data Sheets 109 (2008) 2828-2833] The Low-Fi covariance data are now available at the National Nuclear Data Center. They are separate from ENDF/B-VII.0 and the NNDC warns that this information is not approved by CSEWG. NNDC describes the contents of this collection as: "Covariance data are provided for radiative capture (or (n,ch.p.)for light nuclei), elastic scattering (or total for some actinides), ineslastic scattering (n,2n) reactions, fission and nubars over the energy range from 10(-5{super}) eV to 20 MeV. The library contains 387 files including almost all (383 out of 393) materials of the ENDF/B-VII.O. Absent are data for (7{super})Li, (232{super})TH, (233,235,238{super})U and (239{super})Ra, while (nat)Zn is replaced by 64,66,67,68,70)Zn."[http://www.nndc.bnl.gov/lowfi/index.jsp?z=7] | ||
| DDE Number | DDE00326 | ||
| Special Interface | Yes | ||
| Registration_Required | No |
