标题： 超形变在$^{198}$Po 显示英文标题

标题： Superdeformation in $^{198}$Po

摘要： $^{174}$Yb($^{29}$Si,5n) 反应在薄靶上以148 MeV进行，用于填充$^{198}$Po 中的高角动量状态。 产生的$\gamma$射线通过 Gammasphere 观测到。 发现了一个弱激发的超形变带，包含 10 个$\gamma$-射线跃迁，并已被归为$^{198}$Po。 这是在具有$Z > 83$的原子核的$A \approx 190$区域中首次观察到 SD 跃迁带。 新跃迁带的${\cal J}^{(2)}$与$^{194}$Hg 和$^{196}$Pb 中的基态 SD 跃迁带非常相似。 强度分布表明，该跃迁带是通过 SD 跃迁带与基态线交叉处附近的态以及裂变过程占主导地位的角动量处产生的。 显示英文摘要

摘要： The $^{174}$Yb($^{29}$Si,5n) reaction at 148 MeV with thin targets was used to populate high-angular momentum states in $^{198}$Po. Resulting $\gamma$ rays were observed with Gammasphere. A weakly-populated superdeformed band of 10 $\gamma$-ray transitions was found and has been assigned to $^{198}$Po. This is the first observation of a SD band in the $A \approx 190$ region in a nucleus with $Z > 83$. The ${\cal J}^{(2)}$ of the new band is very similar to those of the yrast SD bands in $^{194}$Hg and $^{196}$Pb. The intensity profile suggests that this band is populated through states close to where the SD band crosses the yrast line and the angular momentum at which the fission process dominates.