Koji Higashiyama

Neutrinoless Double-beta Decay Rates Around Mass 80 In The Nuclear Shell Model

We carry out the nuclear shell model calculations for nuclei with

Schiff Moments Of Xe Isotopes In The Nuclear Shell Model

A=76

Shell Model Calculation Of Nuclei Around 208Pb

and

Shell-model calculations of nuclei around mass 130

A=82

Pair-truncated shell-model analysis for doubly-odd nuclei around mass 130

, and the energy levels are compared with the experimental data for nuclei with

Shell Model Estimate of Electric Dipole Moments for Xe Isotopes

A=82

Application of the generator coordinate method to neutron-rich Se and Ge isotopes

. nWe then estimate the nuclear matrix element (NME) for the

Neutrinoless Double Beta Nuclear Matrix Elements Around Mass 80 in the Nuclear Shell Model

0nubetabeta

Generator Coordinate Method Analysis of Xe and Ba Isotopes

decay by using the ground state wavefunctions. nIn order to investigate the model dependence of the NMEs, the pair-truncated shell model calculations are performed and the NMEs in terms of the wavefunctions are also calculated. nIt is found that the NMEs are considerably different in the models, nalthough the number occupancies in the ground states of the parent and the daughter nuclei are almost unchanged.

Neutrinoless double beta nuclear matrix elements around mass 80 in the nuclear shell-model

The existence of the permanent electric dipole moment of a fundamental particle implies violation nof time reversal invariance. The electric dipole moment of a paramagnetic neutral atom is mainly ninduced by the nuclear Schiff moment. In this study the Schiff moments induced by the interaction nwhich violates parity and time reversal invariance are calculated for various Xe isotopes using the nshell-model wavefunctions. The contributions to the Schiff moment from one-particle and onehole nexcitations turn out to be very different from orbital to orbital. It is also found that the ncontributions from the core excitations are larger than other particle-hole contributions.