The meaning of "Nuclear scientists are not themselves aware"

Question

I am an ESL and preparing GRE exam. In one choice of a question of a reading comprehension passage, there is a sentence like

(A) Nuclear scientists are not themselves aware of all the facts surrounding the deuterium-tritium fusion reaction

I have difficulty understanding the meaning of nuclear scientist are not themselves

Answer 1

In agreement with the comments, I think the meaning here is that most people (non-nuclear scientists) would not be aware of all the facts surrounding the deuterium-tritium fusion reaction, so it is emphasizing that even the nuclear scientists are not either.