揭示$^{34}$ Si中的侵入形变0 $^+_2$态
Unveiling the intruder deformed 0$^+_2$ state in $^{34}$Si
摘要：
在$^{34}$ Si中的0 $^+_2$态已经在{ \sc Ganil/Lise 3}设施中通过新发现的半衰期为26（1）ms的$^{34}$ Al中的1 $^+$异构体的$β$ -衰变来填充。同时检测$e^+e^-$对，可以确定激发能E（0 $^+_2$）=2719（3）keV和半衰期T $_{1/2}$ =19.4（7）ns，由此推导出$ρ^2$（E 0）=13.0（0.9）$\times10^{-3}$的电致发光强度。观察到2 $^+_1$态衰减到0 $^+_1$基态和新观察到的0 $^+_2$态（通过607（2）keV跃迁），比率R（2 $^+_1$ $\rightarrow0^+_1/2^+_1$ $\rightarrow0^+_2$）=1380（717）。收集所有的信息，发现0 $^+_2$态有一个0 $^+_1$的弱混合和一个大的变形参数$β$ =0.29（4），这与使用新的{ \sc sdpf-u-mix}相互作用允许\textit{np-nh}激发穿过N=20壳隙的壳模型计算结果很好地一致。
英文摘要：
The 0$^+_2$ state in $^{34}$Si has been populated at the {\sc Ganil/Lise3} facility through the $β$-decay of a newly discovered 1$^+$ isomer in $^{34}$Al of 26(1) ms half-life. The simultaneous detection of $e^+e^-$ pairs allowed the determination of the excitation energy E(0$^+_2$)=2719(3) keV and the half-life T$_{1/2}$=19.4(7) ns, from which an electric monopole strength of $ρ^2$(E0)=13.0(0.9)$\times10^{-3}$ was deduced. The 2$^+_1$ state is observed to decay both to the 0$^+_1$ ground state and to the newly observed 0$^+_2$ state (via a 607(2) keV transition) with a ratio R(2$^+_1$$\rightarrow0^+_1/2^+_1$$\rightarrow0^+_2$)=1380(717). Gathering all information, a weak mixing with the 0$^+_1$ and a large deformation parameter of $β$=0.29(4) are found for the 0$^+_2$ state, in good agreement with shell model calculations using a new {\sc sdpf-u-mix} interaction allowing \textit{np-nh} excitations across the N=20 shell gap.
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