Progress in the R&D experiments about a novel method of electron scattering off short-lived nuclei

A novel method has been established to realize the experiment of electron scattering off short-lived nuclei. The method was based on the well known "ion trapping" phenomenon in electron storage rings. In the R&D experiments at Kyoto University, stable nucleus, ¹³³Cs, was employed as the target nucleus. The luminosity of scattering experiment was nearly 1026 cm ^-2s ^-1 at electron beam current around 75 mA. The angular distribution of elastically scattered electrons from trapped Cs ions was measured and the result was well fitted by theoretical calculation. It was indicated that higher luminosity can be reached with larger electron beam current.