Implantation perturbed angular correlation experiments in iron after inelastic proton scattering

Abstract

Hyperfine interactions in iron metal have been studied by the standard IMPACT technique, populating the 0.847 MeV, 10.4 ps state of 56 Fe and the 1.408 MeV, 1.42 ps state of 54 Fe via the ( p, p' ) nuclear reaction. Several experiments on 56 Fe were performed independently at the University of Wisconsin Tandem Van de Graaff accelerator laboratory and at the Rutgers-Bell facility. In all cases, the experiments yielded shifts of less than 0.005 rad in the correlation pattern. The low results imply that the average hyperfine field in iron implanted into iron is less than 175 kG during the first 10 ps after implantation. The results are discussed in terms of possible radiation damage and transient field effects, and microscopic details of the IMPACT process are considered.