Lattice site and hyperfine field of Fr in Fe studied by nuclear orientation and emission channelling

The issue of lattice sites of Fr in Fe has been studied with two different techniques, integral low temperature nuclear orientation (LTNO) and emission channelling. Monte Carlo simulations of the system fitted to the channelling spectra reveal a large fraction of Fr in substitutional sites and hint at a possible complex site distribution. Using a two-site model for the LTNO data, a large fraction in high field site, in agreement with the channelling data, is deduced.