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