About the dechanneling due to dislocation loops

The dechanneling width lambda of a dislocation loop is a function of the diameter PHI of the loop. From the expected behaviour of lambda at small and large values of PHI, an hyperbolic variation is proposed both for axial and planar channeling. The dechanneling cross section of perfect loops is proportional to their surface for small loops, and to their length for large ones. (author)