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(Particle and Heavy Ion Transport code System)
MCNP can simulate nuclear criticality and radiation transport in weapons designs. Therefore, its distribution is strictly controlled under U.S. export control laws (including the Export Administration Regulations, EAR). LANL provides MCNP only to qualified users at approved institutions (universities, national labs, government agencies, and authorized corporate partners). mcnp62 download free
For students, independent researchers, or organizations looking for a "free" (as in cost and freedom) Monte Carlo transport code, there are several powerful, open-source alternatives:
developed by Los Alamos National Laboratory (LANL). It is strictly distributed through authorized centers, primarily the Radiation Safety Information Computational Center (RSICC) at Oak Ridge National Laboratory. Los Alamos National Laboratory (.gov) How to Obtain MCNP6.2 Legally Register with RSICC : Users must first register for an account on the RSICC website Submit a Request : You must formally request the MCNP6.2 Code Package (CCC-850) Export Control & Licensing LANL provides MCNP only to qualified users at
For users outside the United States, the NEA Data Bank often handles the distribution of MCNP to member countries.
In the quiet, humming glow of the University’s Nuclear Engineering lab, stared at a 404 error page. He needed Los Alamos National Laboratory (
If you are affiliated with a university or research institution (specifically, a DOE/NNSA laboratory), you can request it through RSICC without a direct license fee.
MCNP6.2 (Monte Carlo N-Particle) is a powerful, general-purpose radiation transport code developed by . Because it contains sensitive nuclear technology, it is not available for open "free download" like standard consumer software. Access is strictly controlled through authorized distribution centers. How to Officially Obtain MCNP6.2
Crucially, the license is . You are not allowed to share your copy with a friend, colleague, or research group without a multi-user license. Each user must apply for their own license. High-performance computing (HPC) centers also require proof of license before allowing access.
Obtaining MCNP6.2 requires following a well-defined procedure through the RSICC. While it involves some paperwork, it is the only safe and legitimate path for serious researchers and professionals.