一般注記To establish the existence of the linear-chain structure, we theoretically investigate excited states in 14C and 16C by using the antisymmetrized molecular dynamics. For 14C, it is found that two types of linear-chain formation, π-bond and σ-bond linear chains, appear in positive-parity states. The calculated excitation energies, moments of inertia, and α-decay widths of the linear-chain states are compared with the observed data reported by recent experiments. The properties of the π-bond linear-chain states reasonably agree with the observation, which convinces us of the linear-chain formation in 14C. In addition, we suggest characteristic decay patterns and Coulomb shifts as the way to distinguish the π-bond and σ-bond linear chains. As a result, the σ-bond linear chain is a good candidate for the higher-lying resonant states reported by a cluster-transfer experiment. For 16C, it is found that the positive-parity linear-chain states have the (3/2π−)2(1/2−σ )2 configuration and primary decay to 12Be(2+1 ) as well as to 12Be(g.s.) by α-particle emission. Moreover, we show that they also decay via the 6He + 10Be channel. In the negative-parity states, it is found that two types of the linear chains exist. One has the valence neutrons occupying the molecular orbits (3/2−π )2(1/2−σ )(3/2+π ), while another configuration cannot be explained in terms of the molecular orbits because of the strong parity mixing. Their α and 6He reduced widths are sufficiently large to be distinguished from other non-cluster states although they are smaller than those of the positiveparity linear chain.
(主査) 准教授 木村 真明, 教授 小林 達夫, 教授 鈴木 久男, 講師 堀内 渉
理学院(宇宙理学専攻)
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受理日(W3CDTF)2019-06-03T12:31:31+09:00
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