Detection of Super-heavy Nuclei ²⁹⁸Fl in Lead by AMS

Theoretical physicists predict that there is an island of stability in nature according to the nuclear shell model, but so far there is no evidence for the existence of super-heavy nuclei. In the paper, a highly sensitive measurement method for super-heavy nuclei ²⁹⁸Fl with accelerator mass spectrometry (AMS) was developed, which mainly included the selection of experimental samples, the determination of ionic extraction form, the transmission and measurement of super-heavy nuclei and the monitoring of the system stability. The count is zero for each measurement of super-heavy nuclei ²⁹⁸Fl. The theoretical calculation result indicates that the upper limit of the number ratio of super-heavy nuclei ²⁹⁸Fl and Pb in lead samples is on the order of 10^-12-10^-14.