I had some time to test my idea but it’s not working. Particles use their bounds for collision handling, not the actual collision of the meshes. I made some sort of a cone mesh with the a centered pivot:
Then I had to add a Collision and an Event Generator Module to the Particle. [Here is a Tutorial][2]
My Setup:
You have to add a bit of velocity to this emitter, since the pivot is centered so the mesh grows to all direction. (This would be different, if the pivot lies on one side of the mesh but then the particle bounds don’t fit the mesh anymore). Notice that this is also kind of inacurate since the collision is a box. Also you don’t have to use a mesh emitter for collision as you can see in the tutorial.
For shortness, here is the blueprint for the collision event:
