Establishment of the measurement technique of the permanent electric dipole moment on an electron with cooled radioactive atoms.

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The search for the permanent electric dipole moment (EDM)of the elementary particle such as the electron is quite important to understand the evolution mechanism of the baryon asymmetry in the universe. In this research program, to study the mechanism of the CP violation with the high accuracy measurement of the electron EDM, we focus on the radioactive element of the francium (Fr), which has the largest enhancement factor of the electron EDM due to the relativistic effect. The new high intensity thermal ionizer with melting target was successfully developed to produce the Fr with the fusion reaction of the <18>^O and <197>^Au. The specifications such as the Fr extraction efficiency of about 35%and production yield with 10^6 Fr+/s well sufficient for the EDM search were achieved. We established the experimental techniques of the Fr production, neutralization, and trapping, which were essential for the EDM search.