Perhaps you should try some spelling variations:
"particle accelerator" » "particle accelerators", "particle acceleration"
"particle acceleraton" » "particle acceleration", "particles acceleration", "particle accelerations"
"particle accelerate" » "particles accelerated", "particle accelerators", "particle acceleration"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("particle accelerator") OR ((("particle accelerate") OR ("particle acceleraton")))).
• Removing quotes may allow a broader search: (( particle accelerator ) or ((( particle accelerate ) or ( particle acceleraton )))).
• Adding a wildcard symbol may retrieve word variants: (("particle accelerator") or ((("particle accelerate") or ("particle acceleraton"))))*.