CERN Accelerating science

Article
Title	Observation of channeling and volume reflection in bent crystals for high-energy negative particles
Author(s)	Scandale, W (CERN) ; Vomiero, A (INFM, Brescia) ; Bagli, E (INFN, Ferrara) ; Baricordi, S (INFN, Ferrara) ; Dalpiaz, P (INFN, Ferrara) ; Fiorini, M (INFN, Ferrara) ; Guidi, V (INFN, Ferrara) ; Mazzolari, A (INFN, Ferrara) ; Vincenzi, D (INFN, Ferrara) ; Milan, R (INFN, Legnaro) ; Della Mea, Gianantonio (Trento U.) ; Vallazza, E (INFN, Trieste) ; Afonin, A G (Serpukhov, IHEP) ; Chesnokov, Yu A (Serpukhov, IHEP) ; Maisheev, V A (Serpukhov, IHEP) ; Yazynin, I A (Serpukhov, IHEP) ; Golovatyuk h, V M (Dubna, JINR) ; Kovalenko, A D (Dubna, JINR) ; Taratin, A M (Dubna, JINR) ; Denisov, A S (St. Petersburg, INP) ; Gavrikov, Yu A (St. Petersburg, INP) ; Ivanov, Yu M (St. Petersburg, INP) ; Lapina, L P (St. Petersburg, INP) ; Malyarenko, L G (St. Petersburg, INP) ; Skorobogatov, V V (St. Petersburg, INP) ; Suvorov, V M (St. Petersburg, INP) ; Vavilov, S A (St. Petersburg, INP) ; Bolognini, D (Insubria U., Como ; INFN, Milan Bicocca) ; Hasan, S (Insubria U., Como ; INFN, Milan Bicocca) ; Mattera, A (Insubria U., Como ; INFN, Milan Bicocca) ; Prest, M (Insubria U., Como ; INFN, Milan Bicocca) ; Shiraishi, S (Fermilab)
Publication	2009
In:	Phys. Lett. B 681 (2009) 233-236
DOI	10.1016/j.physletb.2009.10.024
Subject category	Nuclear Physics - Experiment
Abstract	Deflection due to planar channeling and volume reflection in short bent silicon crystals was observed for the first time for 150 GeV/c negative particles, π− mesons, at one of the secondary beams of the CERN SPS. The deflection efficiency was about 30% for channeling and higher than 80% for volume reflection. Volume reflection occurs, in spite of the attractive character of the forces acting between the particles and the crystal planes, in a wide angular range of the crystal orientations determined by the crystal bend angle.

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