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When a particle crosses a region of space where the curvature radius of themagnetic field line shrinks below its gyroradius $r_{\rm g}$, it experiences anon-adiabatic (magnetic moment violating) change in pitch angle. The presentpaper carries that observation into magnetohydrodynamic (MHD) turbulence toexamine the influence of intermittent, sharp bends of the magnetic field lineson particle transport. On the basis of dedicated measurements in a simulationof incompressible turbulence, it is argued that regions of sufficiently largecurvature exist in sufficient numbers on all scales to promote scattering. Theparallel mean free path predicted by the power-law statistics of the curvaturestrength scales in proportion to $r_{\rm g}^{0.3}\,\ell_{\rm c}^{0.7}$($\ell_{\rm c}$ coherence scale of the turbulence), which is of direct interestfor cosmic-ray phenomenology. Particle tracking in that numerical simulationconfirms that the magnetic moment diffuses through localized, violentinteractions, in agreement with the above picture. Correspondingly, the overalltransport process is non-Brownian up to length scales $\gtrsim\ell_{\rm c}$.

Particle transport through localized interactions with sharp magnetic field bends in MHD turbulence