On a search and identification of superheavy cosmic nucleus tracks in olivine of the extraterrestrial origin

Superheavy cosmic nuclei in olivine of the extraterrestrial origin are searched. Tracks of superheavy nuclei of the galactic origin in meteorite crystals are investigated (1973-1979). To identify tracks of nuclei with >50 up to Z=120 (1980-1983), the technique of selective thermal effect on olivine crystals is applied. In the track length spectrum measured a group of the length 180-230 μm can be singled oUt. This group correspoinds, according to extrapolation in the framework of the Kats-Kobetich model to tracks of nuclei of thoriUm-uranium group. The relative abundance of this group of tracks as compared with the abundance of nuclei of the iron group is (1.5-2)x10-7%. In experiments with Marialachti and Eagle Station olivines 4 tracks of the length 340-365 μm have been found. The relative abundance of anomalously stretched tracks to the tracks of nuclei of thorium-uranium group is (5+-3)X10-3