Different kinds of deflection in a silicon crystal bent along the (111) axis was observed for 150 GeV/c negative particles. mainly pi(-) 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, alpha = 185 mu rad. It was observed volume capture of pi(-) 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 pi(-) mesons by different bent planes crossing the axis.

Deflection of high-energy negative particles in a bent crystal through axial channeling and multiple volume reflection stimulated by doughnut scattering

Fiorini M;Prest M
2010-01-01

Abstract

Different kinds of deflection in a silicon crystal bent along the (111) axis was observed for 150 GeV/c negative particles. mainly pi(-) 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, alpha = 185 mu rad. It was observed volume capture of pi(-) 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 pi(-) mesons by different bent planes crossing the axis.
2010
Crystal, Beam, Deflection, Channeling, Volume reflection
Scandale, W; Vomiero, A; Bagli, E; Baricordi, S; Dalpiaz, P; Fiorini, M; Guidi, V; Mazzolari, A; Vincenzi, D; Milan, R; Della Mea, G; Vallazza, E; Afonin, Ag; Chesnokov, Ya; Maisheev, Va; Yazynin, Ia; Golovatyukh, Vm; Kovalenko, Ad; Taratin, Am; Denisov, As; Gavrikov, Ya; Ivanov, Ym; Lapina, Lp; Malyarenko, Lg; Skorobogatov, Vv; Suvorov, Vm; Vavilov, Sa; Bolognini, D; Hasan, S; Prest, M
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/1733412
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