Perhaps you should try some spelling variations:
"particle accelerators" » "particle accelerations", "particle accelerated", "particle acceleration", "particle accelerating"
"particle accelerator" » "particle acceleration"
"particle accelerate" » "particles accelerated", "particle acceleraton", "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 accelerators") OR ("particle accelerate"))) OR ("particle accelerator")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"particle accelerators\") OR (\"particle accelerate\"))) or (\"particle accelerator\"))".
• Removing quotes may allow a broader search: (((( particle accelerators ) OR ( particle accelerate ))) or ( particle accelerator )).
• Adding a wildcard symbol may retrieve word variants: (((("particle accelerators") OR ("particle accelerate"))) or ("particle accelerator"))*.