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Observation of channeling and volume reflection in bent crystals for high-energy negative particles |
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| Authors: | W. Scandale A. Vomiero E. Bagli S. Baricordi P. Dalpiaz M. Fiorini V. Guidi A. Mazzolari D. Vincenzi R. Milan Gianantonio Della Mea E. Vallazza A.G. Afonin Yu.A. Chesnokov V.A. Maisheev I.A. Yazynin V.M. Golovatyuk A.D. Kovalenko A.M. Taratin A.S. Denisov Yu.A. Gavrikov Yu.M. Ivanov L.P. Lapina L.G. Malyarenko V.V. Skorobogatov V.M. Suvorov S.A. Vavilov D. Bolognini S. Hasan A. Mattera M. Prest S. Shiraishi |
| Affiliation: | 1. CERN, European Organization for Nuclear Research, CH-1211, Geneva 23, Switzerland;2. INFM-CNR, Via Vallotti 9, 25133 Brescia, Italy;3. INFN Sezione di Ferrara, Dipartimento di Fisica, Università di Ferrara, Via Saragat 1, 44100 Ferrara, Italy;4. INFN Laboratori Nazionali di Legnaro, Viale Università 2, 35020 Legnaro (PD), Italy;5. Dipartimento di Ingegneria dei Materiali e Tecnologie Industriali, Università di Trento, Via Mesiano 77, 38050 Trento, Italy;6. INFN Sezione di Trieste, Via Valerio 2, 34127 Trieste, Italy;g Institute of High Energy Physics, Moscow Region, RU-142284 Protvino, Russia;h Joint Institute for Nuclear Research, Joliot-Curie 6, 141980 Dubna, Moscow Region, Russia;i Petersburg Nuclear Physics Institute, 188300 Gatchina, Leningrad Region, Russia;j Università dell''Insubria, via Valleggio 11, 22100 Como, Italy;k INFN Sezione di Milano Bicocca, Piazza della Scienza 3, 20126 Milano, Italy;l Fermi National Laboratory, PO Box 500, Batavia, IL 60510-0500, USA |
| 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. |
| Keywords: | 61.85.+p |
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