Important note by the IAEA-NDS

This repository exists to keep track of modifications of the official NJOY2016 version to ensure the proper processing of the nuclear data libraries distributed by the Nuclear Data Section of the IAEA.

NJOY2016

The NJOY Nuclear Data Processing System is a modular computer code designed to read evaluated data in ENDF format, transform the data in various ways, and output the results as libraries designed to be used in various applications. Each module performs a well defined processing task. The modules are essentially independent programs, and they communicate with each other using input and output files, plus a very few common variables.

Documentation

The documentation for NJOY2016 is found in the NJOY2016-manual repository. There, you can find a pre-compiled PDF of the manual.

Please refer to the Release Notes to see what has changed from one version to the next.

Installation

Instructions for the installation of NJOY2016 are found on our page, Obtaining and Installing NJOY.

Modules

• NJOY directs the flow of data through the other modules and contains a library of common functions and subroutines used by the other modules.
• RECONR reconstructs pointwise (energy-dependent) cross sections from ENDF resonance parameters and interpolation schemes.
• BROADR Doppler broadens and thins pointwise cross sections.
• UNRESR computes effective self-shielded pointwise cross sections in the unresolved energy range.
• HEATR generates pointwise heat production cross sections (KERMA coefficients) and radiation-damage cross sections.
• THERMR produces cross sections and energy-to-energy matrices for free or bound scatterers in the thermal energy range.
• GROUPR generates self-shielded multigroup cross sections, group-to-group scattering matrices, photon-production matrices, and charged-particle cross sections from pointwise input.
• GAMINR calculates multigroup photoatomic cross sections, KERMA coefficients, and group-to-group photon scattering matrices.
• ERRORR computes multigroup covariance matrices from ENDF uncertainties.
• COVR reads the output of ERRORR and performs covariance plotting and output formatting operations.
• MODER converts ENDF "tapes" back and forth between ASCII format and the special NJOY blocked-binary format.
• DTFR formats multigroup data for transport codes that accept formats based in the DTF-IV code.
• CCCCR formats multigroup data for the CCCC standard interface files ISOTXS, BRKOXS, and DLAYXS.
• MATXSR formats multigroup data for the newer MATXS material cross-section interface file, which works with the TRANSX code to make libraries for many particle transport codes.
• RESXSR prepares pointwise cross sections in a CCCC-like form for thermal flux calculators.
• ACER prepares libraries in ACE format for the Los Alamos continuous-energy Monte Carlo code MCNP.
• POWR prepares libraries for the EPRI-CELL and EPRI-CPM codes.
• WIMSR prepares libraries for the thermal reactor assembly codes WIMS-D and WIMS-E.
• PLOTR reads ENDF-format files and prepares plots of cross sections or perspective views of distributions for output using VIEWR.
• VIEWR takes the output of PLOTR, or special graphics from HEATR, COVR, DTFR, or ACER, and converts the plots into Postscript format for printing or screen display.
• MIXR is used to combine cross sections into elements or other mixtures, mainly for plotting.
• PURR generates unresolved-resonance probability tables for use in representing resonance self-shielding effects in the MCNP Monte Carlo code.
• LEAPR generates ENDF scattering-law files (File 7) for moderator materials in the thermal range. These scattering-law files can be used by THERMR to produce the corresponding cross sections.
• GASPR generates gas-production cross sections in pointwise format from basic reaction data in an ENDF evaluation. These results can be converted to multigroup form using GROUPR, passed to ACER, or displayed using PLOTR.

NDS/IAEA updates

The following modules contain modifications: acecm.f90, acedo.f90, acefc.f90, acepa.f90, acepn.f90, acepth.f90, gaspr.f90, groupr.f90, heatr.f90, leapr.f90, matxsr.f90, purr.f90, wimsr.f90 endf.f90, locale.f90, main.f90, moder.f90, plotr.f90, reconr.f90, util.f90, vers.f90, viewr.f90, mainio.f90

Main updates:

• HEATR: Includes patch for using kinematic kermas.
• GROUPR & ACER: Include patches for removing problems found in the processing of the evaluated nuclear data files from FENDL-3.2, IRDFF-II, and IAEA/PD-2019 libraries.
• ACEPN: Includes patch to use the correct fission yield from MF1 to compute the neutron production cross section.
• MATXSR: Includes a patch for generating MATXS files using ASCII-formatted ouput tapes.
• WIMSR: Includes patches for correcting the generation of WIMSD- and WIMSE-formatted libraries.
• PURR: Includes a patch for rejecting samples with total cross section smaller than spot/10 and re-normalizes probability tables to Bondarenko cross sections.
• GASPR: Includes patch for taking into account the desintegration of residual nucleus Li-8 into two alpha particles.
• ACEPN: Includes patch to use the correct fission yield from MF1 to compute the neutron production cross section.

License and Copyright

This software is distributed and copyrighted according to the LICENSE file.