Direct observation of size scaling and elastic interaction between nano-scale defects in collision cascadesX. Yi, A. E. Sand, D. R. Mason, M. A. Kirk, S. G. Roberts, K. Nordlund and S. L. DudarevEPL, 110 3 (2015) 36001DOI: https://doi.org/10.1209/0295-5075/110/36001