从$^{10} $的接近阈值分子状态确定集群 - 截止分支比率

论文标题

从$^{10} $的接近阈值分子状态确定集群 - 截止分支比率

Determination of the cluster-decay branching ratio from a near-threshold molecular state in $^{10}$Be

论文作者

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

论文摘要

$^{10} $ be的$α$ cluster内容的$α$ cluster内容长期存在。进行了一种新的测量，以使用反应$ \ rm {^9be}（\ rm {^9be}，\ rm {^{10} be}^{*}^{*} \rightArrowα+α+ rmmm {^6He}^45。采取了特殊措施来减少较近的阈值背景。还基于三倍的重合测量，也获得了中子末期强度。获得了$（4.04 \ pm 1.26）\ times 10^{ - 4} $的集群 - 截止分支率，从而导致了相当大的$α$ -CLUSTER SPECTROSCOPIC因子。目前的工作证实了由6.18 meV状态为$^{10} $的$σ$ bond分子旋转带的形成。

A puzzle has long existed for the $α$-cluster content in the near-threshold 7.54 MeV state of $^{10}$Be. A new measurement was conducted to measure the cluster-decay partial width of this state, using the reaction $\rm{^9Be}(\rm{^9Be}, \rm{^{10}Be}^{*} \rightarrow α+ \rm{^6He})\rm{^8Be}$ at 45 MeV beam energy. Special measures were taken to reduce the strong near-threshold background. The neutron-decay strength was also obtained based on the three-fold coincident measurement. A cluster-decay branching ratio of $(4.04 \pm 1.26)\times 10^{-4}$ is obtained, resulting in a reasonably large $α$-cluster spectroscopic factor. The present work confirms the formation of the $σ$-bond molecular rotational band headed by the 6.18 MeV state in $^{10}$Be.

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