The spontaneous fission half-lives in superheavy nuclei are predicted by theoretical approaches from the order of few years up to the age of the earth. In this work, all known experimental spontaneous fission half-lives of nuclei with $Z>95$ have been used for the extraction of the effective widths of the parabolic fission barriers with heights from two different theoretical models: FRLDM and ETFSI. The results are discussed with consideration on the shape of the fission barriers for the particular models. By extrapolating the extracted widths of the parabolic barrier, and the calculated fission-barrier heights from the two models, the spontaneous fission half-lives for nuclei with $Z=98-120$ were calculated within the presently suggested semi-empirical approach. Two theoretical models results in completely different scenarios for the shape of fission barrier in superheavy nuclei. Interestingly, the results with FRLDM predict that spontaneous fission in superheavy nuclei and in particular $Z=120$, may compete with α decay, and thus the spontaneous fission branches of these nuclei are significant enough such that they should be considered during experimental studies.

超重核的自发裂变半衰期是通过理论方法预测的，从几年的数量级到地球的年龄。在这项工作中，所有已知的实验原子核自发裂变半衰期均与$ž>95$已经从两个不同的理论模型：FRLDM和ETFSI中提取了具有高度的抛物线形裂变屏障的有效宽度。讨论结果时考虑了特定模型的裂变屏障的形状。通过推断提取的抛物线形屏障的宽度以及两个模型计算出的裂变壁垒高度，原子核的自发裂变半衰期为$ž=98-120$在目前建议的半经验方法中计算。两种理论模型导致超重核裂变屏障的形状完全不同。有趣的是，FRLDM的结果预测超重原子核特别是自发裂变$ž=120$，可能与α衰变竞争，因此这些原子核的自发裂变分支非常显着，因此在实验研究期间应予以考虑。