You can't shoot a hawk. not sure how to prevent the attacks beside a covered run.
ask your local law enforcement they may be able to help you relocate without harming the animal
1. You can NOT shoot a hawk. It's illegal.
2. It's not likely they will trap a hawk to relocate it. Hawks are territorial and it will most likely just come back.
I suggest a covered run. Shelters where chickens can hide. Scarecrows. Being active in the yard so the hawk sees you and knows there are folks about. Plant trees, shrubs and tall grasses to hide chickens. You might even like to stick Picnic table umbrellas around the yard. That might work.
Some have suggested a mirror covered cones hanging around the yard. Not sure I can explain this very well.
Some patterned birds have better camouflage than others. White birds are easy targets. Black birds easy in the winter against the white snow. Barred are good and there are the Cuckoo patterned birds. Penciled Rocks. There are many breeds that come in the Partridge and other patterns.

