Einfluß der anisotropen Abbremsung von Mg²⁴-Rückstoßkernen in Na- und NaCl-Einkristallen auf die Kernresonanzfluoreszenzausbeute

Abstract

The relative nuclear resonance fluorescence (NRF) yield of 1.37 MeV quantas, emitted from Mg²⁴-recoils, was determined in a scattering experiment. In single crystals of Na and NaCl, which were doped with Mg²⁴, a dependence of the NRF yield on the direction of the emitted gamma quantas relative to the orientation of the crystals, was observed. The effect can be explained by taking into account the anisotropic deceleration of the Mg²⁴-recoils in the single crystals. The deceleration was calculated by using Born-Mayer potentials. Results of the calculations of the anisotropic NRF yields are presented and discussed.