No, it does not keep out hawks; it does not really even necessarily keep IN chickens, it will do so to some extent (depending how much they want to be elsewhere) but is not really intended for that (except for meat chickens that don't really fly).
All's it's really meant for is to keep out large 4-legged predators like dogs. It does that reasonably well.
However please realize it is VERY high maintenance. The lowest wires are RIGHT down practically on the ground, and you ABSOLUTELY MUST keep the grass scalped down to the dirt under where the fence is or it will ground out adn be useless. This requires either herbicide applications or regularly moving the fence aside and scalping the fenceline with a weedwhacker. (Mind you the fence is not at all hard to move, but you have to DO it, and make sure it is very well re-tensioned afterwards because sag can also be a big issue in grounding out the fence)
It might indeed be something for you to consider IF the area you'd like the chickens to be in is not predator-protected (as opposed to wherever they are now that you don't want 'em). Just be prepared for the work. Also it is not cheap, especially if you have to buy a charger (and you will need a substantial charger, because it has pretty high resistance and also tends to ground out to some degree no matter how hard you try to avoid it).
If OTOH the area you'd like 'em to be in now is already reasonably well dog-fenced, or could be made so just by adding a few lines of electric, I would suggest considering NONelectric fencing. Of whatever type with mesh small enough to retain chickens adn preferably 4' high. This will keep your chickens in just as well as the electronet (i.e., "sorta kinda as long as they don't want to fly out"), with VASTLY less ongoing work input.
JMHO, good luck, have fun,
Pat