$^{16}$ C中的正宇称直链分子带
Positive-parity linear-chain molecular band in $^{16}$C
摘要：
利用非弹性激发和团簇衰变实验$\rm {^2H}(^{16}C,~{^{4}He}+{^{12}Be}~or~{^{6}He}+{^{10}Be}){^2H}$研究了丰中子$\rm {^{16}C}$中的链状团簇结构。第一次，衰变路径从$\rm {^{16}C}$共振的各种状态的最终核被确定，由于良好的解决$Q$值谱从三重符合测量。根据相关的角关联和衰变分析，16.5 MeV的近阈值共振被指定为预测的正宇称线性链分子带的${(3/2_π^-)^2}{(1/2_σ^-)^2}$配置的${J^π}={0^+}$带头。这个带的其他成员被发现在17.3，19.4和21.6 MeV的基础上，他们的选择性衰变特性，与理论预测一致。在27.2 MeV处观察到另一个有趣的高位态，它几乎完全衰变到$\rm {^{6}He}+{^{10}Be{(\sim6~ MeV)}}$最终通道，与另一个预测的纯$σ$ -键构型的线性链结构很好地对应。
英文摘要：
An inelastic excitation and cluster-decay experiment $\rm {^2H}(^{16}C,~{^{4}He}+{^{12}Be}~or~{^{6}He}+{^{10}Be}){^2H}$ was carried out to investigate the linear-chain clustering structure in neutron-rich $\rm {^{16}C}$. For the first time, decay-paths from the $\rm {^{16}C}$ resonances to various states of the final nuclei were determined, thanks to the well-resolved $Q$-value spectra obtained from the three-fold coincident measurement. The close-threshold resonance at 16.5 MeV is assigned as the ${J^π}={0^+}$ band head of the predicted positive-parity linear-chain molecular band with ${(3/2_π^-)^2}{(1/2_σ^-)^2}$ configuration, according to the associated angular correlation and decay analysis. Other members of this band were found at 17.3, 19.4, and 21.6 MeV based on their selective decay properties, being consistent with the theoretical predictions. Another intriguing high-lying state was observed at 27.2 MeV which decays almost exclusively to $\rm {^{6}He}+{^{10}Be{(\sim6~ MeV)}}$ final channel, corresponding well to another predicted linear-chain structure with the pure $σ$-bond configuration.
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