中文摘要：

理论物理学家根据壳模型预言自然界存在超重稳定岛,然而迄今为止没有找到。本文利用加速器质谱（AMS）开展高灵敏的超重核~（298）Fl的测量方法研究,其中主要包括测量样品的选择、离子源引出形式的确定、超重核的传输与测量和测量系统稳定性的监测。超重核~（298）Fl的每种样品测量计数均为0。理论计算结果表明,在所测的铅样品中,超重核~（298）Fl与Pb的原子个数比值上限约为10-12~10-14。

英文摘要：

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 298F1 with accelerator mass spectrometry （AMS） was developed, which mainly included the selection of experimental samples, the determination of ionic extrac- tion 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 e98 F1. The theoretical calculation result indicates that the upper limit of the number ratio of super-heavy nuclei e98F1 and Pb in lead samples is on the order of 10^-12-10^-14.