CHECK OF THE PARADOXICAL RESULTS OF EXPERIMENTS ON RESONANCE SELF-ABSORPTION OF GAMMA-QUANTA OF AG-109 IN SILVER CRYSTALS

The temperature dependence of the intensity of gamma-quanta of Ag-109 with an energy of 88 keV, emitted in the horizontal and vertical direc tions from a single-crystal plate of silver containing Cd-109, the rad ioactive decay of which produces excited nuclei of Ag-109, is investig ated The gamma radiation of this specimen and a control gamma-source o f Co-57 were recorded by two Ge(Li)-detectors. When the specimen is co oled from 77 K to similar to 12 K there is a relative drop in the inte nsity of gamma-quanta of Ag-109 emitted in the horizontal direction by 0.00064 +/- 0.00044. For the vertical direction the analogous quantit y turned our to be of opposite sign and equal to -0.00047 +/- 0.00051. These preliminary data would appear to favor existing suggestions of a slight broadening of the gamma-resonance of the Ag-109 nuclei in sil ver single crystals. However, in further experiments, in which the acc uracy is increased considerably, it will have to be established whethe r the difference in these quantities is due to some apparatus effects.