MÖSSBAUER EXPERIMENTS WITH HIGH ENERGY GAMMA RAYS : THE 158 keV TRANSITION IN 199Hg W. KOCH, F. E. WAGNER, D. FLACH and G. M. KALVIUS J. Phys. Colloques, 37 C6 (1976) C6-693-C6-695 DOI: 10.1051/jphyscol:19766144