I'm planning to apply for PhD programs for Fall 2016, and I would like to get in contact with physics professor in the universities I'm applying to. I'm applying to 16 PhD programs and after doing research I came up with a list of 64 professors in total out of the 16 schools whose research really interests me. Now, as you know, this is a large amount of professors, and it would take lots of time to go through everyone entire C.V. So I want to ask if it is acceptable to send a mass email to all of them introducing myself and saying I read their research interests on their webpages, and that I'm interested to know if they are taking research assistants. Or would it be expected that I read lots of there papers and be able to cite them in my emails? Thanks a lot I eagerly await your responses.