Abstract
Synopsis The anisotropic angular distribution of the gamma-radiation from aligned 60Co-nuclei has been measured as a function of the magnetic temperature T* of a source, consisting of six (Co 1%, Cu 10%, Zn 89%) (NH4)2(SO4)2.6H2O single crystals. The angular distribution has been determined from T* = 0.02° to T* = 0.08°. The maximum anisotropy at T* = 0.02° is 30%. The experimental results are in reasonable agreement with the theory if we assume the angle 2a between the two axes of nuclear alignment to have the value of 72°. The scintillation counter device and the counting technique are briefly described. The anisotropy effect does not strongly depend on the amount of copper, used as a cooling agent in the crystals. With 20% copper a somewhat larger anisotropy could be achieved.
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