由$^{10}$ Be近阈分子态确定团簇衰变分支比
Determination of the cluster-decay branching ratio from a near-threshold molecular state in $^{10}$Be
摘要：
对于$^{10}$ Be的近阈值7.54 MeV态的$α$ -团簇含量，长期以来一直存在着一个难题。在45 MeV束流能量下，利用反应$\rm{^9Be}(\rm{^9Be}, \rm{^{10}Be}^{*} \rightarrow α+ \rm{^6He})\rm{^8Be}$测量了该态的团簇衰变部分宽度。采取了特别措施，以减少强烈的近阈值背景。根据三重符合测量，还获得了中子衰变强度。得到了$(4.04 \pm 1.26)\times 10^{-4}$的簇衰变分支比，从而得到了相当大的$α$ -簇光谱因子。本工作证实了在$^{10}$ Be中形成了以6.18 MeV能级为首的$σ$键分子转动带.
英文摘要：
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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