Possible Clues:

• Physicist with a unit of distance named after him
• Enrico -- Institute
• Pioneer atom splitter
• Italian, Nobel-winning physicist, d. 1954
• Enrico, Italian Nobel prize physicist
• Winner of the 1938 Nobel Prize in Physics
• Not all prefer microbiologists — he was a nuclear physicist
• Eponym for a Batavia, IL particle physics lab
• Tiny distance unit
• Pioneer in the development of nuclear power