Preparation of isotopically enriched Sn-112,Sn-116,Sn-120,Sn-124 targets at VECC

Resistive heating and mechanical rolling methods have been employed to prepare isotopically enriched thin target foils of Sn-116 (similar to 380 mu g/cm(2)), Sn-124 (similar to 400 mu g/cm(2)) and thicker foils of Sn-112 (similar to 1.7 mg/cm(2)),Sn-120 (similar to 1.6 mg/cm(2)), respectively. Preparation of enriched targets with a small amount of material, selection of releasing agent for thin targets and separation of deposited material in solvent were among the several challenges during fabrication of the thin targets. The uniformity of the targets has been measured using Am-241 alpha-source. NaCl has been used as releasing agent in preparation of the thin targets. These targets have been successfully used in nuclear physics experiments at VECC.