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EnglishDifferent kinds of deflection in a silicon crystal bent along the ⟨111⟩ axis was observedfor 150GeV/c negative particles, mainly π− mesons, at one of the secondary beams of the CERN SPS. The whole beam was deflected to one side in quasi-bound states of doughnut scattering (DSB) by atomic strings with the efficiency (95.4 ±0.2)% and with the peak position close to the bend crystal angle, α=185μrad. It was observed volume capture of π− mesons into the DSB states with a probability higher than 7%. A beam deflection opposite to the crystal bend was observed for some orientations of the crystal axis due to doughnut scattering and subsequent multiple volume reflections of π− mesons by different bent planes crossing the axis.
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| Data di pubblicazione: | 2010 | |
| Titolo: | Deflection of high-energy negative particles in a bent crystal through axial channeling and multiple volume reflection stimulated by doughnut scattering. | |
| Autori: | 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. Yazyning; V.M. Golovatyuk; A.D. Kovalenko; A.M. Taratinh; 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; M. Prest | |
| Rivista: | PHYSICS LETTERS. SECTION B | |
| Abstract: | Different kinds of deflection in a silicon crystal bent along the ⟨111⟩ axis was observedfor 150GeV/c negative particles, mainly π− mesons, at one of the secondary beams of the CERN SPS. The whole beam was deflected to one side in quasi-bound states of doughnut scattering (DSB) by atomic strings with the efficiency (95.4 ±0.2)% and with the peak position close to the bend crystal angle, α=185μrad. It was observed volume capture of π− mesons into the DSB states with a probability higher than 7%. A beam deflection opposite to the crystal bend was observed for some orientations of the crystal axis due to doughnut scattering and subsequent multiple volume reflections of π− mesons by different bent planes crossing the axis. | |
| Digital Object Identifier (DOI): | 10.1016/j.physletb.2010.09.025 | |
| Handle: | http://hdl.handle.net/11392/1404045 | |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
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