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arXiv 2212.05940nucl-th
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形状共存岛:理论预言与实验证据

Islands of shape coexistence: theoretical predictions and experimental evidence

Andriana Martinou, Dennis Bonatsos, S. K. Peroulis, K. E. Karakatsanis, T. J. Mertzimekis, N. Minkov

AI总结:

研究结合 proxy-SU(3) 双壳机制无参数预言与 DDME2 协变密度泛函计算,指出粒子-空穴型形状共存仅存在于特定质子或中子数区间构成的“岛屿”,并得到偶偶核 β、γ 带实验数据支持。

摘要:

基于原子核 proxy-SU(3) 对称性中双壳机制的无参数理论预言,以及采用 DDME2 泛函的协变密度泛函理论计算均表明,建立在粒子-空穴激发机制上的形状共存(SC)不会在核图上处处出现,而是局限于质子或中子数处于 7-8、17-20、34-40、59-70、96-112、146-168 区域内的若干岛屿。对具有 K=0(β)和 K=2(γ)带的偶偶核数据的系统学研究支持这些岛屿的存在:每当 K=0 带带头 0_2^+ 与基带第一激发态 2_1^+ 能量接近时,形状共存便会出现,而 0_2^+ 位于 2_1^+ 之下的核正处于这些岛屿的中心。此外,还简要讨论了导致多重形状共存的一种简单理论机制。

英文摘要:

Parameter-free theoretical predictions based on a dual shell mechanism within the proxy-SU(3) symmetry of atomic nuclei, as well as covariant density functional theory calculations using the DDME2 functional indicate that shape coexistence (SC) based on the particle-hole excitation mechanism cannot occur everywhere on the nuclear chart, but is restricted on islands lying within regions of 7-8, 17-20, 34-40, 59-70, 96-112, 146-168 protons or neutrons. Systematics of data for even-even nuclei possessing K=0 (beta) and K=2 (gamma) bands support the existence of these islands, on which shape coexistence appears whenever the K=0 bandhead 0_2^+ and the first excited state of the ground state band 2_1^+ lie close in energy, with nuclei characterized by 0_2^+ lying below the 2_1^+ found in the center of these islands. In addition a simple theoretical mechanism leading to multiple shape coexistence is briefly discussed.

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。

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