The operational consensus of physical scientists is that physicalism holds. That is, experiments are planned and executed as if physicalism is true. The reasons are simple: no compelling evidence has been found to the contrary despite various attempts (e.g. intercessory prayer studies, psi studies, etc.); and it makes planning and interpreting experiments much easier (and it works).
Whether individual scientists hold different personal views is a sociological question to which I do not have a definitive answer. The overwhelming majority of theistic positions are not physicalist, and
the National Academy of Science charted belief in God as low as 5.5 percent among biologists and 7.5 percent among physicist and astronomers in a 1998 study
(source). So at least 5-8% of scientists are apparently not physicalists, but this doesn't really answer how many actually are.
I am not sure what the rates are among social scientists, but I'm also not sure why they would be in any better of a position to judge the merits of physicalism than are lawyers or investment bankers. As their title says, they work in heavily social settings where whether something is physical or not is an implementation detail that they don't need to worry about.