Bose-Einstein condensation of dilute alpha clusters above the four-α threshold in 16O in the field theoretical superfluid cluster model
Bose-Einstein condensation of dilute alpha clusters above the four-α threshold in 16O in the field theoretical superfluid cluster model
复制标题
场论超流体团簇模型中 16O 中四-α 阈值以上稀 α 团簇的玻色-爱因斯坦凝聚
DOI：
10.1093/ptep/ptaa117
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发表时间：
2020
影响因子：
3.5
通讯作者：
Ohkubo S
中科院分区：
文献类型：
--
作者：
Takahashi J;Yamanaka Y;Ohkubo S
本文利用定义了序参量的场论超流团簇模型，从团簇玻色-爱因斯坦凝聚的观点出发，研究了在四阈值以上的O原子中观察到的发展良好的团簇态。通过计算首次较好地再现了实验能级。特别是，所观察到的16.7 MeV和18.8 MeV的低激发能量的阈值被认为是理解为Nambu-Goldstone零模式运营商的状态的表现形式，与自发的整体相位，这是由玻色-爱因斯坦凝聚的真空15.1 MeV的状态与一个稀释的良好的developedcluster结构刚好高于阈值引起的破缺。这证明了玻色-爱因斯坦凝聚体的存在。研究发现，在阈值以上，具有发达团簇结构的能级结构的出现是稳健的，在显著的凝聚率下，几乎与团簇的凝聚率无关.在O的四个阈值以上出现类似C的能级结构的机制的发现，进一步加强了玻色-爱因斯坦凝聚的概念。
Observed well-developedcluster states inO located above the four-threshold are investigated from the viewpoint of Bose–Einstein condensation ofclusters by using a field-theoretical superfluid cluster model in which the order parameter is defined. The experimental energy levels are reproduced well for the first time by calculation. In particular, the observed 16.7 MeVand 18.8 MeVstates with low-excitation energies from the threshold are found to be understood as a manifestation of the states of the Nambu–Goldstone zero-mode operators, associated with the spontaneous symmetry-breaking of the global phase, which is caused by the Bose–Einstein condensation of the vacuum 15.1 MeVstate with a dilute well-developedcluster structure just above the threshold. This gives evidence of the existence of the Bose–Einstein condensate ofclusters inO. It is found that the emergence of the energy level structure with a well-developedcluster structure above the threshold is robust, almost independently of the condensation rate ofclusters under significant condensation rate. The finding of the mechanism that causes the level structure that is similar toC to emerge above the four-threshold inO reinforces the concept of Bose–Einstein condensation ofclusters in addition toC.