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arXiv 1402.1407nucl-thnucl-ex
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介质内相似重整化群的非微扰壳模型相互作用

Nonperturbative shell-model interactions from the in-medium similarity renormalization group

S. K. Bogner, H. Hergert, J. D. Holt, A. Schwenk, S. Binder, A. Calci, J. Langhammer, R. Roth

摘要:

利用介质内相似性重整化群,首次基于手征两核子和三核子相互作用,从头计算构造了中等质量核的价空间哈密顿量。当应用到氧同位素,我们发现实验基态能量很好地再现,包括在24 O滴线以外的平坦趋势。同样,21,22,23,24 O的自然宇称谱与实验一致,我们提出了25,26 O的激发态的预测。结果表现出弱依赖的谐振子基参数和重现光谱内的标准sd价空间。

英文摘要:

We present the first ab initio construction of valence-space Hamiltonians for medium-mass nuclei based on chiral two- and three-nucleon interactions using the in-medium similarity renormalization group. When applied to the oxygen isotopes, we find experimental ground-state energies are well reproduced, including the flat trend beyond the drip line at 24O. Similarly, natural-parity spectra in 21,22,23,24O are in agreement with experiment, and we present predictions for excited states in 25,26O. The results exhibit a weak dependence on the harmonic-oscillator basis parameter and reproduce spectroscopy within the standard sd valence space.

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