Computational Nuclear Physics

This page provides nuclear data, physics simulations, and data processing tools available for download and is hosted by the Computational Nuclear Physics Group (CNP) at Lawrence Livermore National Laboratory.
Nuclear Data The CNP group collects and evaluates experimental data and theoretical calculations produced at LLNL and around the world. The results are then organized into databases that are used as inputs to simulations. Tools are also provided that enable users to interactively modify the data for sensitivity and uncertainty studies. Nuclear data can be interactively viewed using NADS.

Generalized Nuclear Data (GND) format source code available from:

ENDF/B-VII.1 library is available in GND format

Data Processing The CNP group processes the databases into tailored formats to increase the efficiency of laboratory simulation codes. Support is provided for thermonuclear reaction rates, Monte Carlo particle transport and deterministic particle transport.
Methods R&D The CNP group develops new computational techniques to improve the performance of particle and radiation transport codes. The group has efforts in Monte Carlo particle tracking, radiation transport schemes and random number generators.
Physics Simulations LLNL has developed self-contained physics simulations that can be interfaced to any parent transport code. Currently we provide three distinct simulation codes: cosmic-ray shower distributions near the Earth's surface, gamma-ray source spectra from nuclear decay of aged mixtures of radioisotopes, and discrete neutron and gamma-ray emission from fission. We also provide interface examples for popular Monte Carlo transport codes such as MCNP, MCNPX, and Geant4.

Administrative Information

Bret Beck (

Updated: September 11, 2013