Novel chiral Hamiltonian and observables in light and medium-mass nuclei
Novel chiral Hamiltonian and observables in light and medium-mass nuclei
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DOI：
10.1103/physrevc.101.014318
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发表时间：
2019-07
影响因子：
3.1
通讯作者：
V. Somà;Petr Navrátil;F. Raimondi;F. Raimondi;C. Barbieri;T. Duguet;T. Duguet
中科院分区：
文献类型：
--
作者：
V. Somà;Petr Navrátil;F. Raimondi;F. Raimondi;C. Barbieri;T. Duguet;T. Duguet
介绍了一种基于手征有效场论的哈密顿量参数化方法。具体而言，三核子运营商在下一个到下一个到领先的顺序与现有的（和成功的）两体相互作用包含条款下一个到下一个到下一个到领先的顺序。由此产生的电势被标记为$N\！N\！$+$ 3N\text{（lnl）}$.本工作的目的是研究这种新的哈密顿量在轻核和中等质量核中的性能。采用无核壳模型和自洽的绿色函数方法计算了结合能、核半径和激发光谱。用$N\！N\！$+$ 3 N\text {（lnl）}$比较，目前使用的其他两个代表性的哈密顿，即NNLO$_{\text{sat}}$和旧的$N\！N\！$+$ 3N（400）$。总的来说，小说互动的表现非常令人鼓舞。在轻核中，总能量一般与实验数据吻合得很好。已知的光谱也很好地再现了一些值得注意的例外。对基态能量的良好描述适用于更重的原子核，从氧到镍同位素。除了那些涉及激发过程跨越$N=20$间隙，这是高估了新的相互作用，光谱是非常好的质量，在一般上级与NNLO$_{\text{sat}}$。虽然在很大程度上改善了$N\！N\！$+$ 3 N（400）$结果，用$N\！N\！$+$ 3N\text{（lnl）}$仍然低估了实验值，与成功再现镍的可用数据的NNLO$_{\text{sat}}$计算值相反。总的来说，新的二加三核子哈密顿量在目前的工作中介绍了现有的核相互作用的一个有前途的替代。
A novel parameterisation of a Hamiltonian based on chiral effective field theory is introduced. Specifically, three-nucleon operators at next-to-next-to-leading order are combined with an existing (and successful) two-body interaction containing terms up to next-to-next-to-next-to-leading order. The resulting potential is labelled $N\!N\!$+$3N\text{(lnl)}$. The objective of the present work is to investigate the performance of this new Hamiltonian across light and medium-mass nuclei. Binding energies, nuclear radii and excitation spectra are computed using no-core shell model and self-consistent Green's function approaches. Calculations with $N\!N\!$+$3N\text{(lnl)}$ are compared to two other representative Hamiltonians currently in use, namely NNLO$_{\text{sat}}$ and the older $N\!N\!$+$3N(400)$. Overall, the performance of the novel interaction is very encouraging. In light nuclei, total energies are generally in good agreement with experimental data. Known spectra are also well reproduced with a few notable exceptions. The good description of ground-state energies carries on to heavier nuclei, all the way from oxygen to nickel isotopes. Except for those involving excitation processes across the $N=20$ gap, which is overestimated by the new interaction, spectra are of very good quality, in general superior to those obtained with NNLO$_{\text{sat}}$. Although largely improving on $N\!N\!$+$3N(400)$ results, charge radii calculated with $N\!N\!$+$3N\text{(lnl)}$ still underestimate experimental values, as opposed to the ones computed with NNLO$_{\text{sat}}$ that successfully reproduce available data on nickel. On the whole, the new two- plus three-nucleon Hamiltonian introduced in the present work represents a promising alternative to existing nuclear interactions.