I had some classes at RINSC years ago, research reactors used to be super common and a lot of universities used to have them, the facility had tons of scientific equipment from other reactors that shut down. Wouldn’t surprise me at all if brown had one too, a particle accelerator would make more sense as the regulatory approval for those is a lot easier. RI’s nuclear science community is super tiny and full of nerds so I’m sure if you contacted them they’d know more about it.

Highly recommend finding a tour of the place sometime if possible, you can see the tiny reactor glow blue, and the building was made on a WWII gun emplacement so the foundation in the basement is really weird