arXiv 1702.006172017-02-02nucl-ex

$^{14}$ C中$σ$ -键直链态的选择性衰变

Selective decay from a candidate of the $σ$-bond linear-chain state in $^{14}$C

J. Li, Y. L. Ye, Z. H. Li, C. J. Lin, Q. T. Li, Y. C. Ge, J. L. Lou, Z. Y. Tian, W. Jiang, Z. H. Yang, J. Feng, P. J. Li, J. Chen, Q. Liu, H. L. Zang, B. Yang, … 展开作者

J. Li, Y. L. Ye, Z. H. Li, C. J. Lin, Q. T. Li, Y. C. Ge, J. L. Lou, Z. Y. Tian, W. Jiang, Z. H. Yang, J. Feng, P. J. Li, J. Chen, Q. Liu, H. L. Zang, B. Yang, Y. Zhang, Z. Q. Chen, Y. Liu, X. H. Sun, J. Ma, H. M. Jia, X. X. Xu, L. Yang, N. R. Ma, L. J. Sun

备注：: 6 pages, 4 figures
发表信息：: Phys. Rev. C 95, 021303 (2017)
DOI：: 10.1103/PhysRevC.95.021303

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摘要：

使用45 MeV的入射束能量进行团转移实验$^9$ Be（$^9$ Be，$^{14}$ C $^*\rightarrowα$ + $^{10}$ Be）$α$。该反应通道具有大的$Q$值，其有利于填充$^{14}$ C中的高激发态并分离各种反应通道。一些共振态的重建从前向发射$^{10}$ Be + $α$片段相对于三组区分良好的最终状态，其中大部分同意与以前的观察。发现$^{14}$ C中22.5（1）MeV的态主要衰变到$^{10}$ Be子核中6 MeV附近的态，这与预测的$σ$ -键直链分子态带头的独特性质一致.在23.5（1）MeV处发现了一个新态，它强烈地衰变到$^{10}$ Be的第一激发态。

英文摘要：

A cluster-transfer experiment $^9$Be($^9$Be,$^{14}$C$^*\rightarrowα$+$^{10}$Be)$α$ was carried out using an incident beam energy of 45 MeV. This reaction channel has a large $Q$-value that favors populating the high-lying states in $^{14}$C and separating various reaction channels. A number of resonant states are reconstructed from the forward emitting $^{10}$Be + $α$ fragments with respect to three sets of well discriminated final states in $^{10}$Be, most of which agree with the previous observations. A state at 22.5(1) MeV in $^{14}$C is found to decay predominantly into the states around 6 MeV in $^{10}$Be daughter nucleus, in line with the unique property of the predicted band head of the $σ$-bond linear-chain molecular states. A new state at 23.5(1) MeV is identified which decays strongly into the first excited state of $^{10}$Be.

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