Elsevier

Physics Letters B

Volume 680, Issue 4, 5 October 2009, Pages 301-304
Physics Letters B

High-efficiency deflection of high-energy negative particles through axial channeling in a bent crystal

https://doi.org/10.1016/j.physletb.2009.09.009Get rights and content

Abstract

Deflection due to axial channeling in a silicon crystal bent along the 〈111〉 axis was observed for 150 GeV/c negative particles, mainly π mesons, at one of the secondary beams of the CERN SPS. The whole beam was deflected to one side with the efficiency of about 90% and with the peak position at the bend crystal angle α=43μrad. The deflection occurs mainly due to doughnut scattering of above-barrier particles by the atomic strings of the crystal. However, due to a high probability of particle recapture into bound states with the atomic strings their contribution to the deflection should be about 15% for our case according to simulation results.

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