a clustering in Si 28 probed through the identification of high-lying 0 + states
a clustering in Si 28 probed through the identification of high-lying 0 + states
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通过识别高位 0 态探测 Si 28 中的聚类
DOI：
10.1103/physrevc.95.024319
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发表时间：
2017
影响因子：
3.1
通讯作者：
Adsley P
中科院分区：
文献类型：
--
作者：
Adsley P
背景：光共轭核的核结构方面长期以来一直与基于粒子和重共轭体系（如和）的核聚类有关。这种结构与强变形相关联，对应于超变形甚至超变形带。超变形带已经在原子核及其邻近区域被识别出来，并在壳层模型、平均场模型和簇模型中得到了很好的描述。通过将此类研究扩展到包含轻共轭核（如和）的更具挑战性的情况，可以进一步探索簇描述的效用。目的：本研究的目的是寻找等标态的数量和能量。这些态是与奇异结构相对应的超变形能带的潜在带头。特别感兴趣的是定位先前确定的超变形带的带头。方法：在南非的iThemba加速器科学实验室进行了目标在非常向前的角度上的粒子非弹性散射。在K600磁谱仪上对激发能在6 ~ 14 MeV范围内的散射粒子进行动量分析，并在焦平面上使用两个多线漂移室和两个塑料闪烁体进行检测。结果：在9兆电子伏特以上已经确定了几个状态。新发现的9.71 MeVstate是先前讨论的超变形带的强候选带头。半微观代数模型的多通道动力学对称性预测了激发态的谱。理论预测与实验结果吻合较好，支持了9.71-MeV态作为超变形能带的带头。结论：已经确定了细胞的激发等标态。实验中所观察到的态数与多通道动力学对称性的预测相吻合。
Background:Aspects of the nuclear structure of light-conjugate nuclei have long been associated with nuclear clustering based onparticles and heavier-conjugate systems such asand. Such structures are associated with strong deformation corresponding to superdeformed or even hyperdeformed bands. Superdeformed bands have been identified inand neighboring nuclei and find good description within shell model, mean-field, and-cluster models. The utility of the-cluster description may be probed further by extending such studies to more challenging cases comprising lighter-conjugate nuclei such as, and.Purpose:The purpose of this study is to look for the number and energy of isoscalarstates in. These states are the potential bandheads for superdeformed bands incorresponding to the exotic structures of. Of particular interest is locating thebandhead of the previously identified superdeformed band in.Methods:-particle inelastic scattering from atarget at very forward angles includinghas been performed at the iThemba Laboratory for Accelerator-Based Sciences in South Africa. Scattered particles corresponding to the excitation energy region of 6 to 14 MeV were momentum-analysed in the K600 magnetic spectrometer and detected at the focal plane using two multiwire drift chambers and two plastic scintillators.Results:Severalstates have been identified above 9 MeV in. A newly identified 9.71 MeVstate is a strong candidate for the bandhead of the previously discussed superdeformed band. The multichannel dynamical symmetry of the semimicroscopic algebraic model predicts the spectrum of the excitedstates. The theoretical prediction is in good agreement with the experimental finding, supporting the assignment of the 9.71-MeV state as the bandhead of a superdeformed band.Conclusion:Excited isoscalarstates inhave been identified. The number of states observed in the present experiment shows good agreement with the prediction of the multichannel dynamical symmetry.