Pressure Dependence of the Recoilless Fraction For 14.4keV Transition of Fe57 in Copper

The effect of pressur on the recoilless fraction (1) for the gamma-ray transition 14.4 keV emitted by Fe57 as an impurity in copper, using phonon frequency spectrum (pfs) analysis and Debye model calculations has been studied. The variation in Grneisen parameter () and Debye temperature (D) with pressure are included as included as improvement over previous studies. The transition results which have been obtained are in good agreement with the experimental values .