Very short-lived radiation effects in solids following Coulomb excitation

The simple thermal theory of Seitz and Koehler is adopted to predict the decrease in observed recoil free fraction expected when one observes the Moessbauer effect following Coulomb excitation of odd isotopes of several rare earths. Experiments were performed to investigate five short-lived Moessbauer transitions in the rare earth isotopes 165Ho(97 keV,2 psec), 167Er(79 keV,100 psec), 173Lu(113 keV,100 psec), 173Yb(78.7 keV,40 psec), and 159Tb(58 keV,130 psec). Results are presented for metal and oxide targets at both low and elevated temperatures. (6 figures, 1 table) (U.S.)