Experimental evidence of antiproton reflection by a solid surface

Details Experimental evidence of antiproton reflection by a solid surface Experimental evidence of antiproton reflection by a solid surface

2008-02-20

arxiv.org/abs/0802.2893v2

Phys.Rev.A78:022506,2008

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages with 5 figures

Scientific paper

10.1103/PhysRevA.78.022506

We report here experimental evidence of the reflection of a large fraction of a beam of low energy antiprotons by an aluminum wall. This derives from the analysis of a set of annihilations of antiprotons that come to rest in rarefied helium gas after hitting the end wall of the apparatus. A Monte Carlo simulation of the antiproton path in aluminum indicates that the observed reflection occurs primarily via a multiple Rutherford-style scattering on Al nuclei, at least in the energy range 1-10 keV where the phenomenon is most visible in the analyzed data. These results contradict the common belief according to which the interactions between matter and antimatter are dominated by the reciprocally destructive phenomenon of annihilation.

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