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

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 accelerators") OR ("particle accelerate"))))) OR ("particle acceleraton")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"particle accelerator\") or (((\"particle accelerators\") OR (\"particle accelerate\"))))) or (\"particle acceleraton\"))".
• Removing quotes may allow a broader search: (((( particle accelerator ) or ((( particle accelerators ) OR ( particle accelerate ))))) or ( particle acceleraton )).
• Adding a wildcard symbol may retrieve word variants: (((("particle accelerator") or ((("particle accelerators") OR ("particle accelerate"))))) or ("particle acceleraton"))*.