Particle in collision

Is there a way how to target particle what caused collision in script attached to emitor?

 void OnParticleCollision (GameObject obj) {
     //gameobject  is the emitter
     //obj is the object hitted (colided) with particle
     //but how to acces that exact particle what caused collision (and destroy it)   
 }

I thought that setting lifetime loss on collision will destroy that particle but it did not. Maybe I am missing something important in order to do this right, any advice would be helpfull, thanks