Progress of Studies on Reaction Dynamics Induced by Proton Drip-line Nuclei at Energies Around the Coulomb Barrier

Reaction dynamics, especially the breakup mechanisms, induced by proton drip-line nuclei at energies around the Coulomb barrier, is one of the most popular topics in nuclear physics. In order to further investigate the reaction mechanisms of proton drip-line nuclei, we performed the complete-kinematics measurements of ⁸B+¹²⁰Sn and ¹⁷F+⁵⁸Ni at CRIB, University of Tokyo. This paper summarizes our research findings and unveils for the first time the fusion cross-section results in the ⁸B+¹²⁰Sn measurement. Two detector arrays, i.e., the silicon telescope array of STARE and the ionization chamber array of MITA, were designed respectively for the measurements of ⁸B and ¹⁷F. Reaction products were completely identified with the help of these two arrays. For the ⁸B+¹²⁰Sn system, the coincident measurement of the breakup fragments was achieved for the first time. The correlations between the breakup fragments reveal that the prompt breakup occurring on the outgoing trajectory dominates the breakup dynamics of ⁸B. For ¹⁷F+⁵⁸Ni, the complete reaction channel information, such as quasi-elastic scattering, breakup and total fusion, was derived for the first time. An enhancement of the fusion cross section of ¹⁷F+⁵⁸Ni was observed at the energy below the Coulomb barrier. Theoretical calculations indicate that this phenomenon is mainly due to the coupling to the continuum states. Moreover, different direct reaction dynamics were found in ⁸B and ¹⁷F systems, suggesting the influence of proton-halo structure on the reaction dynamics.