Theoretical investigation of the standard model through electric dipole moment

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We studied the nuclear structure and nuclear Schiff moments and obtained the following results. (1) We performed shell-model calculations for neutron-rich Se, As, Ge, and Ga isotopes, and compared the calculated energy levels and electromagnetic transitions with the experimental data. Through the analysis of the shell model results, it is confirmed that the spin alignment of two neutrons in the 0g9/2 orbital becomes apparent at high spins. (2) We developed a new algorithm for generator coordinate method calculations in order to investigate the structure in transitional nuclei. The application of this model to the even-even Se and Ge nuclei indicated the importance of triaxial deformation in the mass 80 region. (3) Nuclear Schiff moments for the ground states around the mass 130 arising from the nucleon intrinsic EDM are calculated in terms of the nuclear shell model. We estimated the upper limit for the EDM of neutral 129Xe atom using the Schiff moment.