Delbr\"uck scattering at energies 140 - 450 MeV
  The differential cross section of Delbr\"{u}ck scattering is measured on a bismuth germanate $Bi_4Ge_3O_{12}$ target at photon energies $140 - 450 MeV$ and scattering angles $2.6 - 16.6 mrad$. A good agreement with the theoretical results, obtained exactly in a Coulomb field, is found. 
SH.ZH. Akhmadaliev, G.Ya. Kezerashvili, S.G. Klimenko, V.M. Malyshev,   A.L. Maslennikov, A.M. Milov, A.I. Milstein, N.Yu. M...