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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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http://hdl.handle.net/11392/1404045| Titolo: | Deflection of high-energy negative particles in a bent crystal through axial channeling and multiple volume reflection stimulated by doughnut scattering. |
| Autori interni: | BAGLI, Enrico BARICORDI, Stefano DALPIAZ, Pietro FIORINI, Massimiliano GUIDI, Vincenzo MAZZOLARI, Andrea VINCENZI, Donato |
| Data di pubblicazione: | 2010 |
| 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. |
| Handle: | http://hdl.handle.net/11392/1404045 |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
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