863.6 – 810.6 keV γ - γ Directional Correlation in ⁵⁸ Fe

Abstract

The decay scheme of ⁵⁸Co is particularly simple¹) (fig. 1). The γγ directional correlation of the 863.6 – 810.6 keV cascade from the decay of ⁵⁸Co was measured by several authors^2–6) with Nal (Tl) detectors. What should be, in principle, straight forward measurements are rendered difficult by the low intensity of the 863.6 keV γ — ray and by the proximity of the 863.6 keV γ — ray to the very intense 810.6 keV γ — ray. Nevertheless, reasonably consistent results have been obtained in five different measurements with ⁵⁸Co sources as shown in table 1.