Proton pack

The Proton pack is a fictional energy weapon used for weakening ghosts and aiding in capturing them within the Ghostbusters universe. First depicted in the film Ghostbusters, it has a hand-held wand ("Neutrino Wand" or particle thrower) connected to a backpack-sized particle accelerator. It fires a positively charged stream of protons that polarizes the negatively charged energy of a ghost, allowing it to be held in the stream,