How do I install Mekanism: Neutron Activator?

Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. Download the .jar. Put it in the .minecraft/mods folder and launch that loader profile. Opens on CurseForge — not every file is mirrored on our own servers.

What Minecraft version does Mekanism: Neutron Activator work with?

The listing gives Minecraft 1.20.1, 1.21.1, 1.18.2. This is the version stated by the author or source site, not something we verified ourselves.

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Mekanism: Neutron Activator

Java mod listed for Minecraft 1.18–1.21. Downloads from the MC Java Mods app on Android.

by michanide · on CurseForge

Which build do you need?

This mod ships a separate file for every mod loader and every version of the game. Pick both, then download — the wrong build installs fine and then does nothing in the game.

Mod loader

Mod loader NeoForge2 builds
Mod loader Forge2 builds

Minecraft version

Minecraft 1.21.1Newest
Minecraft 1.20.1

Minecraft 1.20.1Newest
Minecraft 1.18.2

⬇ Download for 1.21.1 · NeoForge ⬇ Download for 1.20.1 · NeoForge ⬇ Download for 1.20.1 · Forge ⬇ Download for 1.18.2 · Forge

I don't know my version or loader

Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.

No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.

Open in MC Java Mods Get it on Google Play →

Mekanism has processing technology which uses neutron. This technology is necessary for processing radioactive waste and producing D-T fuel. Currently practical method uses neutron beams from the sun. This method has the weakness of being weather and climate dependent. This weakness can lead to the shutdown of fusion reactors and leakage of radioactive waste.

That is the reason why we developed a new method. This new method uses a fusion reaction as a neutron source. This method is weather and climate independent and can overcome the weaknesses of current methods.

PS: We developed another method which uses nuclear waste. This is for the environments where the sun is unavailable.

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft versions listed: 1.20.1, 1.21.1, 1.18.2
How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.

Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.

File checked by MCModsHub

Ships as mekanismneutronactivator-1.21.1-1.0.0.jar — drop this file into the mods folder
Download size: 71 KB
Download link checked 2 Oct 2026 — working

These come from our own check of the pack file, not from the source page.

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All Mods for Java All Minecraft Java mods Java mods for 1.20 Java mods for 1.21 Java mods for 1.18