Target Preparation

Electrochemical deposition techniques have been widely utilized to fabricate actinide targets for experiments to synthesize new superheavy elements (SHEs). The electrochemical deposition technique, often called molecular plating, is increasingly being used and still under development for optimization. This technique involves the deposition of target material from an organic solution using an applied electrical potential. We have concentrated on the development of actinide targets for the studies on SHEs. Actinide targets for SHE synthesis using 48Ca beams have included 238U, 237Np, 242,244Pu, 243Am, 245,248Cm, 249Bk, and 249Cf. Now, our main task is the production of 243Am targets with a thickness range from 300 to 500 μg/cm2 for the SHE synthesis. Because the 243Am material is only in very limited amounts, the molecular plating method with high deposition yields was used. To determine the optimum conditions for the plating of 243Am, time and current density dependency of yield was investigated. The tasks are divided mainly into three different fields: the procurement of the materials, the production of the targets and the recovery of the materials.

Most of the targets needed are produced for the synthesis of superheavy elements, as well as those for other department from IMP are involved. For measurement of TOF of fast neutrons, we produced the cylindrical targets of 238U, as well as the large 238U targets with a diameter up to 6 cm.