质子滴线核17F+58Ni在近垒能区的准弹性散射角分布研究

Study on Quasi-elastic Scattering Angular Distribution of Proton Drip-line Nucleus 17F+58Ni at Energy near Coulomb Barrier

  • 摘要: 质子滴线核17F的质子分离阈仅601 keV,其结构可视为16O+p,且其第一激发态呈现质子晕结构。开展17F实验研究,对深入了解丰质子弱束缚核的反应机制有重要意义。本工作依托中国科学院近代物理研究所RIBLL1终端提供的次级束17F轰击58Ni靶,利用自主研发的电离室+硅探测器的望远镜阵列,实现了17F和16O等重离子的完全鉴别,得到了17F+58Ni体系在Elab=63.0 MeV的准弹性散射角分布。进一步通过连续态离散化耦合道方法进行理论分析,计算结果能较好描述实验数据;考虑与不考虑连续态耦合效应的计算结果并无显著差异,表明17F的破裂连续态对于17F+58Ni体系弹性散射道的影响并不显著。

     

    Abstract: 17F is a proton drip-line nucleus, which is an unstable weakly bound nucleus. As a proton drip-line nucleus, the proton separation energy of 17F is merely 601 keV. Its structure can be described as 16O+p. The first excited state of 17F was predicted to present a proton-halo structure. The experimental study of 17F is of great significance for further understanding the reaction mechanism of proton-rich weakly bound nuclei. In this work, the reaction mechanisms of 17F+58Ni at the energy near the Coulomb barrier were investigated with the beam provided by the RIBLL1 terminal in Lanzhou. 17F and 16O were completely identified by using a self-designed telescope array consisting of ionization chambers and silicon detectors. The quasi-elastic scattering angular distribution of 17F+58Ni at Elab=63.0 MeV was obtained. Further theoretical calculations were carried out by continuum-discretized coupled-channels method, which can reproduce the experimental data reasonably well. Moreover, there is no significance difference between the calculations with and without couplings to the continuum states, indicating that the coupling effect on the continuum states of 17F is not strong for the elastic scattering channel.

     

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