Perhaps you should try some spelling variations:
"pparticle accelerations" » "particle accelerations", "particle acceleration", "particles acceleration"
"particle accelerators" » "article accelerators", "particle accelerator", "particle accelerated", "particle 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 accelerators") OR ("pparticle accelerations"))*.
• Removing quotes may allow a broader search: (( particle accelerators ) or ( pparticle accelerations ))*.