Perhaps you should try some spelling variations:
"particle acceleraton" » "particle acceleration", "particles acceleration", "particle accelerations"
"particle accelerator" » "particle acceleration"
"particle accelerators" » "particle accelerations", "particle accelerated", "particle accelerate", "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 acceleraton") OR ((("particle accelerator") OR ("particle accelerators")))).
• Removing quotes may allow a broader search: (( particle acceleraton ) or ((( particle accelerator ) or ( particle accelerators )))).
• Adding a wildcard symbol may retrieve word variants: (("particle acceleraton") or ((("particle accelerator") or ("particle accelerators"))))*.