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We report three-center cluster structures in the excited states of 11B(11C), 8He and 14C based on theoretical calculations with the antisymmetrized molecular dynamics (AMD). In particular we discuss the cluster gas-like states 2α + t(2α+3He) in 11B(11C) and α + 2n + 2n in 8He. In 14C, the 3α linear-chain structure is discussed. [ABSTRACT FROM AUTHOR]

We propose a new method of the β-γ constraint for quadrupole deformation in antisymmetrized molecular dynamics (AMD) to describe various cluster and shell-model structures in the ground and excited states of light nuclei. To check its applicability, we apply this method to N = 6 isotones, 10Be, 12C, 9Li, and 11B, and find various shell-model and cluster structures as functions of the deformation parameters, β and γ. We also investigate 14C with the β-γ constraint AMD. For positive-parity states, above the ground band, three excited bands with the developed 3α-cluster core structures are suggested. Characteristic structures such as a triaxial structure and a linear-chain structure having 10Be+α correlation appear in the excited bands. [ABSTRACT FROM AUTHOR]