~（12）C中三角D_3h对称性的证据
Evidence for Triangular D_3h Symmetry in 12C
摘要：
本文报道了在22.4（0.2）MeV的12 C原子核中测量到的一个新的高自旋Jp = 5态，它与预言的具有D_3h对称性的扁等边三角形陀螺的基态转动带非常吻合，其特征是0+，2+，3-，4+/-，5-，几乎简并的4+和4-（宇称二重态）.在三原子分子中观察到了这种D_3h对称性，这在核物理中是第一次。我们讨论了12 C中其他旋转振动带的分类，例如（0+）霍伊尔带和（1-）弯曲模带，并建议进行测量以寻找预测的（“缺失”）状态，这些状态可能为12 C中的聚集提供新的线索和轻核。特别是观测（或不观测）霍伊尔带中的预测（“缺失”）态将使我们能够得出结论，在12 C中，在7.654 MeV处，组成霍伊尔态的三个α粒子的几何排列。
英文摘要：
We report a measurement of a new high spin Jp = 5- state at 22.4(0.2) MeV in 12C which fits very well to the predicted (ground state) rotational band of an oblate equilateral triangular spinning top with a D_3h symmetry characterized by the sequence 0+, 2+, 3-, 4+/-, 5- with almost degenerate 4+ and 4- (parity doublet) states. Such a D_3h symmetry was observed in triatomic molecules and it is observed here for the first time in nuclear physics. We discuss a classification of other rotation-vibration bands in 12C such as the (0+) Hoyle band and the (1-) bending mode band and suggest measurements in search of the predicted ("missing") states that may shed new light on clustering in 12C and light nuclei. In particular the observation (or non-observation) of the predicted ("missing") states in the Hoyle band will allow us to conclude the geometrical arrangement of the three alpha-particle composing the Hoyle state at 7.654 MeV in 12C.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
