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We examine here the acceleration of particles and high energy collisions inthe the Janis-Newman- Winicour (JNW) spacetime, which is an extension of theSchwarzschild geometry when a massless scalar field is included. We show thatwhile the center of mass energy of collisions of particles near the eventhorizon of a blackhole is not significantly larger than the rest mass of theinteracting particles, in an analogous situation, it could be arbitrarily largein the JNWspacetime near the naked singularity. The high energy collisions areseen to be generic in the presence of a photon sphere in the JNW spacetime,whereas an extreme fine-tuning of the angular momentum of the collidingparticles is required when the photon sphere is absent. The center of massenergy of collision near the singularity grows slowly for small and extremelylarge deviations from the Schwarzschild blackhole, but for intermediatestrengths of the scalar field it rises moderately fast. As a possible andpotentially interesting application, we point out that the presence of suchhigh energy collissions may help the blackhole configurations to bedistinguished from a naked singularity.

Acceleration of particles by Janis-Newman-Winicour singularities