VIM Nuclear Data Libraries

The VIM data libraries consist of datasets (VIM Material Files), one for each nuclide at a specified temperature. If a different temperature is required, then a separate Material File is used for that composition. These datasets are processed only at Argonne, using a sequence of codes that are completely independent of other cross section codes, e.g., NJOY.

Description of the VIM Libraries
VIM reads the Material Files directly. The ENDF/B-VI and JEF2.2 files listed here were not included with VIM Version 3.6, but are included with VIM Version 4.0.

• VIM Nuclides Available (Listed Alphabetically)
• VIM Nuclides Available (Listed Numerically by VIM ID)
• VIM Production Library Historical Information (.pdf)
• Obtaining Cross Section Edits, Plots, etc.: XSEDIT2

Accessing VIM Nuclear Data
The nuclear data libraries are accessed at the beginning of each VIM calculation. Materials can be mixed from different libraries, e.g., ENDF/B-IV Pu239 and ENDF/B-V H2O.

Using multigroup cross sections (ISOVIM)
Multigroup calculations can be performed using VIM Material Files in the continuous-energy format, but containing piecewise-constant cross sections.

• User's Guide
• Multigroup VIM Scripts
• Standard Microscopic Group Neutron Cross Section Format (ISOTXS)

VIM Material Files: Specifications
The details of the VIM Material File formats are provided here.