So, you cant actually craft the antimatter science pack in the particle accelerator. The building in question does not accept the recipe for it, despite it showing up in its recipe tab. Im not sure if that is an actual bug, or if that is still WIP. Though it might be, because if you use creative and unlock all tech, every following tech and recipe works perfectly fine.
Also there is no way to actually research using the antimatter science pack, since the labs do not have a slot to equip it to use it for research.
