Fundamental Design Study for Target/Ion Source to Produce ⁸Li Beam

Radioactive isotope beam (RIB) can enhance an application field of a conventional radioactive isotope (RI), because RIB technique can control detail characteristics of RI such as a polarization or a penetration depth. For example, 8Li is should be polarized and the energy. The fundamental design study for TIS to produce ⁸Li beam is conducted in this study. ⁸Li is produced by the 100-MeV proton accelerator with the beryllium oxide target. The optimum target thickness, which can achieve enough ⁸Li production rate and avoid unnecessary neutron production, is determined by FLUKA simulation. The optimum thickness is about 24 mm. ⁸Li production rate with the optimum thickness is about 10¹0 pps by 1 μA of the 100-MeV proton beam. Also, the lithium ionization efficiency of the several surface ion source materials. The rhenium is adopted to enhance the selective ionization effect. This paper includes very fundamental results of the design study. More detail design study and computational analysis has been conducted. The TIS for ⁸Li beam will be fabricated and examined by further experimental study.