Linear-chain and gas-like structures in nuclei near 12C.

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. [ABSTRACT FROM AUTHOR]