Session 2WFB: Time-Dependent Approaches in Nuclear Physics II

Real-time evolution of Gaussian wave packets: its application to the nuclear cluster problems

The time-dependent cluster model, which describes nucleons in terms of Gauss wave packets and determines their time evolution, was used to simulate heavy-ion reactions and later developed into wave packet theories of nuclei such as Fermionic Molecular Dynamics (FMD) and antisymmetrized Molecular Dynamics (AMD). While the time evolution of these models is not exact because the wave functions are restricted to Gauss functions, it is known that the ensemble of wave functions generated by the time evolution has desirable quantum properties. Accordingly, we have developed a new approach to nuclear structure and reactions by utilizing the properties of this ensemble. In this presentation, I will introduce the model and demonstrate some applications to the alpha cluster states and astropysical nuclear reactions.   

Baryon interaction from the time-dependent HAL QCD method on the lattice

We present the latest lattice QCD results for baryon interactions obtained at nearly physical quark masses. Baryon forces are calculated from Nambu-Bethe-Salpeter (NBS) correlation functions using the time-dependent HAL QCD method in which energy-independent (non-local) potentials can be extracted without relying on the ground state saturation. The method is applied to derive  nuclear forces, hyperon forces including coupled channel systems.   

Reveal the dynamics of three-body decay

Exotic decay occurs beyond the dripline of the nuclear landscape. Among these decays, two-proton (2p) radioactivity is a unique three-body process that involves the emission of two protons from the ground state of even-Z neutron-deficient nuclei. Such exotic decay is of particular interest as it provides invaluable information on nucleon-nucleon correlation. The interplay between inner structure and final-state interaction can also help us gain deep insight into the universal properties of open quantum systems. To study the mechanism of three-body decay, we developed a time-dependent approach that allows us to probe emitted nucleons at long times and large distances. We demonstrated that the time evolution of the two-nucleon wave function is strongly impacted by the diproton/dineutron dynamics. The correlations between emitted nucleons provide invaluable information on the dinucleon structure in the initial state.