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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.


The user manual for NJOY2016 can be found here: NJOY User Manual (pdf).

Release and development versions

For the latest version of NJOY2016 and an overview of the latest changes, please see the Release Notes or the release page.

The latest release version of NJOY2016 can always be found at the head of the main branch of this repository and every release is associated to a release tag. New versions are released on a regular basis (we aim to provide updates at least every three months). The latest development version of NJOY2016 containing the latest updates and changes can be found in at the head of the develop branch. This development version should be used with caution.



The following are the prerequisites for compiling NJOY2016:

  • git
  • cmake 3.15 or higher
  • a Fortran 2003 compliant compiler such as gcc-7 or higher

Note: gcc-11.3 has been known to produce an internal compiler error while compiling NJOY2016, so as a result this specific version of gcc is not supported. Other versions of gcc (version 7 or higher) seem to be capable of compiling NJOY2016.


To compile the latest NJOY2016 version, you can use the following instructions:

git clone
cd NJOY2016
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release ../
make -j8

The above instructions will produce a release build consisting of a dynamic library and dynamically linked executable. To compile a static version (i.e. the executable is not a dynamically linked executable), the cmake command shown above should be replaced with the following cmake command:

cmake -DCMAKE_BUILD_TYPE=Release -Dstatic_libraries=ON
      -Dstatic_njoy=ON -DCMAKE_EXE_LINKER_FLAGS=-static ../

When you have already cloned the NJOY2016 repository and wish to update to the latest version, you can use the following instructions (inside the build folder):

git pull
make -j8

Module overview

  • 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.

License and Copyright

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