Experiments studying the velocity dependence of the transient field for Pt-196 in Fe and the transient field for Pt-194,Pt-196,Pt-198 in Gd have been carried out in order to make comparisons with the recent Lindhard-Winther theory. Agreement between theory and experiment is good concerning the shape of the velocity dependence, but the experimental value is a factor of 2 larger than theoretically predicted. A large precession due to the transient field (phi = -51 +/- 7 mrad) has been found for Pt in Gd. A transient field precession for Pd and Cd in Gd has been computed on the basis of recent radioactivity results. The internal field for Pt in Gd has been measured to be -780 +/- 120 kG, while former internal field values for Mo, Ru, and Hf in Gd have been corrected for transient field effects.

The recoil implanation perturbed angular correlation technique, IMPACT, has been used to study the hyperfine interaction in180Hf in iron and gadolinium. The perturbed angular correlation through the Coulomb excited 4+ state was used, thus minimizing the effect of quadrupole interactions. The effective hyperfine fields on Hf in iron and gadolinium are determined to have the same sign,negative, and magnitudes of (507±60) kOe and (304±31) kOe, respectively. Results are compared with values reported from several other experiments ostensibly measuring the same quantity. Problems inherent in the various experimental techniques are considered.

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.

The gyromagnetic ratio, g, for the first excited 2+ states of 25 even-even isotopes of Ge, Se, Mo, Cd, Pd, Ru and Te were obtained using the ion implantation perturbed angular correlation technique. The g factors were extracted from the measured precession angles using known lifetimes, equilibrium hyperfine magnetic field values and transient hyperfine magnetic field data for fast ions in ferromagnetic lattices. The results indicate that the g factors vary little for the states studied, and are close to the collective value Z/A.

The ion-implanation perturbed-angular-correlation technique has been used to determine the hyperfine magnetic fields on samarium-150 nuclei in ferromagnetic iron, cobalt, nickel, and gadolinium lattices. Assuming the published value of 1400 kG for the field on samarium in iron, it follows that the hyperfine fields on samarium in cobalt and nickel, at 300\ifmmode^\circ\else\textdegree\fi{}K, are 1119\ifmmode\pm\else\textpm\fi{}64 and 352\ifmmode\pm\else\textpm\fi{}13 kG, respectively; and in gadolinium at 110\ifmmode^\circ\else\textdegree\fi{}K, -295\ifmmode\pm\else\textpm\fi{}30 kG. The hyperfine fields in iron, cobalt, and nickel are proportional to the atomic monents of the respective hosts. The major contribution to the field on samarium in gadolinium can be accounted for by polarized conduction-electron exchange. The gyromagnetic ratio for the 334-keV ${2}^{+}$ level in ${\mathrm{Sm}}^{150}$ is determined to be 0.47\ifmmode\pm\else\textpm\fi{}0.06.

States in 143Nd and 145Sm have been investigated by the 142Nd(d, p) and 144(d, p) reactions at a deuteron energy of 12 MeV. Additional information on these states was obtained from the 143Nd(d, d') reaction and by measurements of the gamma rays in coincidence with the stripping protons (d, pγ). The l-values, spins, parities and spectroscopic factors were determined for a number of states in each of these nuclei.