Fifteen correlated alpha-decay chains starting from the odd-A superheavy nucleus 289Fl were observed, indicating the existence of parallel alpha-decay sequences and different spin-parity assignments in close-lying levels. The ground-state spin assignment was found to change between (285)Cn and (281)Ds based on observed coincidences and fine structure analysis. These experimental results provide a direct testing ground for theory and are compared with new nuclear structure calculations.
Fifteen correlated alpha-decay chains starting from the odd-A superheavy nucleus 289Fl were observed following the fusion-evaporation reaction Ca-48 + Pu-244. The results call for at least two parallel alpha-decay sequences starting from at least two different states of (289)Fl. This implies that close-lying levels in nuclei along these chains have quite different spin-parity assignments. Further, observed alpha-electron and alpha-photon coincidences, as well as the alpha decay fine structure along the decay chains, suggest a change in the ground-state spin assignment between (285)Cn and (281)Ds. Our experimental results, on the excited level structure of the heaviest odd-N nuclei to date, provide a direct testing ground for theory. This is illustrated by comparison with new nuclear structure calculations based on the symmetry-conserving configuration mixing theory.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据