通过寿命测量证明$^{98}$ Zr中存在共存形状
Evidence for coexisting shapes in $^{98}$Zr through lifetime measurements
摘要：
在GANIL进行的实验中，用距离多普勒频移方法测量了$^{98}$ Zr中的第一激发2 $^+$、4 $^+$和6 $^+$态的寿命。利用6.2 MeV/u $^{238}$ U束和$^{9}$ Be靶之间的裂变反应填充$^{98}$ Zr中的激发态。用EXOGAM阵列检测$γ$射线，并与VAMOS++光谱仪中鉴定的裂变碎片的质量和原子序数相关。我们的结果显示在$^{98}$ Zr中非常小的B（E2;2 $_1^+$ $\rightarrow$ 0 $_1^+$）值，从而证实在$N=60$处非常突然的集体性开始。将实验结果与大尺度Monte Carlo Shell模型和超平均场计算结果进行了比较。目前的结果表明，在这个核中的两个额外的变形形状共存的球形基态。
英文摘要：
The lifetimes of first excited 2$^+$, 4$^+$ and 6$^+$ states in $^{98}$Zr were measured with the Recoil-Distance Doppler Shift method in an experiment performed at GANIL. Excited states in $^{98}$Zr were populated using the fission reaction between a 6.2 MeV/u $^{238}$U beam and a $^{9}$Be target. The $γ$ rays were detected with the EXOGAM array in correlation with the fission fragments identified in mass and atomic number in the VAMOS++ spectrometer. Our result shows very small B(E2;2$_1^+$ $\rightarrow$ 0$_1^+$) value in $^{98}$Zr thereby confirming the very sudden onset of collectivity at $N=60$. The experimental results are compared to large-scale Monte Carlo Shell model and beyond mean field calculations. The present results indicate coexistence of two additional deformed shapes in this nucleus along with the spherical ground state.
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