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Search for Superheavy Elements in Uranium Irradiated with High-Energy Protons

The recent reports of M A R I N O V et al. [1] on the possible production of eka-mercury (Z = 112) in tungsten targets bombarded with 24 GeV protons, have lead many experimenters [2] to initiate similar searches for superheavy elements in beam-stop targets of highenergy particle accelerators. In one of these investigations, a 72 g uranium target was irradiated with 4 Χ 10 protons at 24 GeV/c in an external beam of the CERN proton synchroton. The bombarded target was subjected to vacuum distillation at 1400 °C by a CERNOrsay-Heidelberg collaboration [3] searching for superheavy elements in the volatile fraction. From the residue, after dissolving it in nitric acid, W O L F et al. [4] volatilized osmium, extracted the uranium into tributyl-phosphate (TBP) and separated a lanthanide fraction, looking for eka-osmium and transuranium actinides, respectively. After these operations, two liquid samples remained.