Speaker
Description
Reaction with Exotic Nuclei at Near- and Sub-barrier Energies become a hot topic of current interest in nuclear physics. In the talk, I would like to present recent results obtained in the nuclear reaction group of CIAE.
The first topic is on the optical model potentials (OMPs) of exotic nuclear systems. Due to the limitations of intensity and quality of RIBs, it is difficult to extract the OMPs of exotic nuclear systems by the elastic scattering. For this reason, a transfer reaction method was proposed and applied to extract the OMPs of 6He+12C, 64Zn, 209Bi systems via 11B, 63Cu, 208Pb(7Li,6He) reactions [1]. The threshold anomaly behavior has been obtained in the 6He+209Bi system for the first time [2]. Results show that the dispersion relation is not applicable for the exotic nuclear systems. Possible reasons are discussed but further study is strongly required to discover the underlying physics.
The second topic is on the reaction mechanism of exotic nuclear systems. An important task is to understand the breakup effects as well as its mechanism. To this end, a complete-kinematics measurement method was developed and applied in the 17F+58Ni, 89Y [3], 208Pb and 7Be+208Pb experiments. The processes of elastic scattering, breakup/transfer, and fusion evaporation have been identified successfully. Preliminary results of 17F+58Ni show that elastic breakups are dominant, moreover, the fusions are suppressed above the barrier while enhanced below the barrier.
[1] L. Yang, C. J. Lin, H. M. Jia et al., Phys. Rev. C 96, 044615 (2017); Phys. Rev. C 95, 034616 (2017); Phys. Rev. C 89, 044615 (2014); Phys. Rev. C 87, 047601 (2013).
[2] L. Yang, C. J. Lin, H. M. Jia et al, Phys. Rev. Lett. 119, 042503 (2017).
[3] G. L. Zhang, G. X. Zhang, C. J. Lin et al., Phys. Rev. C 97, 044618 (2018).
