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The optical potential is a key tool for describing interactions in nuclear collisions and is widely used in studies of nuclear reaction mechanisms. It is highly sensitive to nuclear structure, leading to distinct characteristics between weakly bound and tightly bound nuclear systems.For weakly bound nuclei such as 6Li, 9Be and 6He, the behavior of the optical potential remains controversial due to insuffcient experimental data at near-barrier and deep-barrier energies.In this work, elastic scattering angular distributions for the 6Li+208Pb system were measured at near-barrier and deep-barrier energies. Optical model fitting was employed to extract the optical potential parameters. The results indicate an anomalous threshold anomaly in the optical potential of this system, and the dispersion relation is not applicable.Furthermore, the reaction threshold for the 6Li+208Pb system was determined to be approximately 0.73VB based on deep-barrier data. A systematic analysis was also performed on the reaction thresholds and breakup thresholds of different nuclear systems.This work measured the optical potential of the 6Li+208Pb system at near-barrier and deep sub-barrier energies, providing data support for further investigation of the anomalous threshold anomaly.The datasets presented in this paper are openly available at https://www.doi.org/10.57760/sciencedb.j00213.00218 (Please use the private access link https://www.scidb.cn/s/URZNbe to access the dataset during the peer review process)
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