Possibility of Observing Spiral Scattering of Relativistic Particles in   a Bent Crystal
  The peak position, impact-parameter range, and optimal conditions for observing spiral scattering of relativistic particles in a uniformly bent crystal are estimated. The existence of spiral scattering with a square-root singularity is pointed out. In this case, the secondary process of volume capture to the channeling mode is absent and the conditions for observing this effect are most favorable. 
Gennady V. Kovalev
cond-mat.other cond-mat.mtrl-sci quant-ph