Nuclear resonant scattering of synchrotron radiation from 161Dy at 25.61 keV

Nuclear resonant scattering of synchrotron radiation from the 25.6 keV level of Dy-161 is studied with two techniques: nuclear forward scattering (NFS) and nuclear incoherent scattering (NIS). NFS time spectra of Dy metal are measured at temperatures ranging from 15 K to 80 K. They reveal electron spin relaxation in ferromagnetic dysprosium with long relaxation times of similar or equal to 10-30 ns. NIS energy spectra of Dy2O3 at room temperature are measured with meV resolution. Scattering accompanied by phonon excitation is observed.