论文标题
形状共存在$ n = z $同位素$^{72} $ kr中通过非弹性散射
Shape coexistence revealed in the $N=Z$ isotope $^{72}$Kr through inelastic scattering
论文作者
论文摘要
$ n = z = 36 $ nucleus $^{72} $ kr已通过中等能量的非弹性散射研究。两个目标，$^{9} $和$^{197} $ au，用于提取核变形长度，$δ_\ text {n} $，以及减少的$ E2 $过渡概率，$ b（e2）$。以前未知的非厌食$ 2^+$和$ 4^+$状态以及Octupole $ 3^ - $状态的新候选者已在BE Target的散射中观察到，并基于$γ-γ$ cociscisences的级别计划。在AU目标上的散射中也观察到了第二个$ 2^+$状态，并且可以首次确定$ b（e2; \; \; 2^+_ 2 \ rightarrow 0^+_ 1）$值。用两波段混合模型来分析结果显示出明确的证据证明了扁质形状并存，并且可以通过从扁平的基态变化来解释，从扁平的基态变形，从第一个$ 2^+$状态划定了变形的yrast频段。使用GOGNY D1S相互作用，通过超出平均场计算来证实这种解释。
The $N=Z=36$ nucleus $^{72}$Kr has been studied by inelastic scattering at intermediate energies. Two targets, $^{9}$Be and $^{197}$Au, were used to extract the nuclear deformation length, $δ_\text{N}$, and the reduced $E2$ transition probability, $B(E2)$. The previously unknown non-yrast $2^+$ and $4^+$ states as well as a new candidate for the octupole $3^-$ state have been observed in the scattering on the Be target and placed in the level scheme based on $γ-γ$ coincidences. The second $2^+$ state was also observed in the scattering on the Au target and the $B(E2;\;2^+_2 \rightarrow 0^+_1)$ value could be determined for the first time. Analyzing the results in terms of a two-band mixing model shows clear evidence for a oblate-prolate shape coexistence and can be explained by a shape change from an oblate ground state to prolate deformed yrast band from the first $2^+$ state. This interpretation is corroborated by beyond mean field calculations using the Gogny D1S interaction.
