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The glue-like behavior of valence neutrons has been investigated in the Li isotopes. The 7Li nucleus is well known to be weakly bound system with the α + t cluster structure. By adding the valence neutrons, the reduction of the root-mean-square (RMS) radius of the proton density for the 7Li, 8Li and, 9Li nuclei is also well known from the viewpoint of the experimental data and theoretical approach. Elastic scattering cross sections of the Li isotopes on the 12C and 28Si targets at E/A ∼ 50 MeV are calculated. We find the change of the channel coupling (CC) effect on elastic scatterings of such Li isotopes by the glue-like role of the valence neutrons. Finally, we realize that the valence neutrons stabilize the binding of core parts, and the CC effect related the core excitation is indeed reduced., PROCEEDINGS OF THE 4TH INTERNATIONAL WORKSHOP ON “STATE OF THE ART IN NUCLEAR CLUSTER PHYSICS” (SOTANCP4), 13–18 May 2018, Texas, USA.

Linear-chain and gas-like structures have been investigated in nuclei near 12C by using antisymmetrized molecular dynamics combined with generator coordinate method. We found that linear-chain structures and gas-like structures of three clusters exist quite universally. 10Be, 11B, and 12C have gas-like states of 2α+dineutron, 2α+t, and 3α structures, respectively. There are linear-chain states, in which 2α clusters are formed and valence nucleons occupy the σ-orbit. In neutron-rich C isotopes, linear-chain structures of three α clusters surrounded by excess neutrons appear. Excess neutrons stabilize the linear chain structures, and therefore, linear-chain states appear below the 3α+Xn threshold energy. In 14C, candidates of the linear-chain states are observed in recent 10Be+α resonant scattering experiments.Linear-chain and gas-like structures have been investigated in nuclei near 12C by using antisymmetrized molecular dynamics combined with generator coordinate method. We found that linear-chain structures and gas-like structures of three clusters exist quite universally. 10Be, 11B, and 12C have gas-like states of 2α+dineutron, 2α+t, and 3α structures, respectively. There are linear-chain states, in which 2α clusters are formed and valence nucleons occupy the σ-orbit. In neutron-rich C isotopes, linear-chain structures of three α clusters surrounded by excess neutrons appear. Excess neutrons stabilize the linear chain structures, and therefore, linear-chain states appear below the 3α+Xn threshold energy. In 14C, candidates of the linear-chain states are observed in recent 10Be+α resonant scattering experiments.

We developed a new variational method of tensor-optimized antisymmetrized molecular dynamics (TOAMD) to treat the bare interactions for finite nuclei. In TOAMD, two kinds of the correlation functions for tensor force and short-range repulsion are multiplied to the AMD wave function successively in the power series form. Each correlation function in every correlation term is independently optimized in the total energy variation. We show the results of TOAMD for s-shell nuclei using bare AV8’ NN potential. The binding energy and the Hamiltonian components nicely reproduce the values of the few-body calculations. The energies obtained in TOAMD are shown to be lower than those of the variational Monte Carlo method based on the Jastrow’s product-type correlation functions. This means that the power series expansion using the independent correlation functions in TOAMD describes the nuclei better than the Jastrow correlation method. We further extended TOAMD by adopting the multi-configuration of the AMD wave functions, which include the high-momentum (HM) components of nucleon motions. This framework is called high-momentum TOAMD (HM-TOAMD) and we show the results of HM-TOAMD for s-shell nuclei.We developed a new variational method of tensor-optimized antisymmetrized molecular dynamics (TOAMD) to treat the bare interactions for finite nuclei. In TOAMD, two kinds of the correlation functions for tensor force and short-range repulsion are multiplied to the AMD wave function successively in the power series form. Each correlation function in every correlation term is independently optimized in the total energy variation. We show the results of TOAMD for s-shell nuclei using bare AV8’ NN potential. The binding energy and the Hamiltonian components nicely reproduce the values of the few-body calculations. The energies obtained in TOAMD are shown to be lower than those of the variational Monte Carlo method based on the Jastrow’s product-type correlation functions. This means that the power series expansion using the independent correlation functions in TOAMD describes the nuclei better than the Jastrow correlation method. We further extended TOAMD by adopting the multi-configuration of the AMD wave fu...

Structures of ground and excited states of C isotopes are discussed based on theoretical calculations with the antisymmetrized molecular dynamicsmethod. The structure change depending on the neutron number along the C isotope chain is investigated. The quenching of E2 transition strength in 16C and 18C is discussed in relation with decoupling of deformations between proton and neutron densities. E1 transition strength is also studied with the time-dependent AMD method. Possible cluster states are suggested in excited states of neutron-rich C.