Doubly magic nuclei from lattice QCD forces at M PS = 469 MeV / c 2
Doubly magic nuclei from lattice QCD forces at M PS = 469 MeV / c 2
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DOI：
10.1103/physrevc.97.021303
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发表时间：
2017-01
影响因子：
3.1
通讯作者：
Chris Mcilroy;C. Barbieri;T. Inoue;T. Doi;T. Hatsuda
中科院分区：
文献类型：
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作者：
Chris Mcilroy;C. Barbieri;T. Inoue;T. Doi;T. Hatsuda
在味SU（3）极限和赝标介子质量为469 MeV/c2的情况下，基于格点QCD模拟得到的双核子势，对闭壳层核4 He，16 O和40 Ca进行了从头算自洽绿色函数计算.核子-核子相互作用用HAL QCD方法得到，短程排斥用模型空间外的阶梯近似处理。我们的研究结果表明，这种方法对角化紫外自由度正确。因此，即使对于HAL QCD相对硬的势，也可以从红外外推得到基态能量。与以前的Brueckner Hartree-Fock计算相比，通过充分考虑多体关联，总结合能得到了明显的提高。结果表明，一个有趣的可能的行为，在非常大的π介子质量和岛屿的稳定性是在第一次出现在传统的doublymagic数周围时，π介子质量降低到其物理值的核是不受约束的。计算得到的单核子谱分布与真实的核的谱分布在性质上接近，即使在考虑赝标介子质量的情况下也是如此。
We perform ab initio self-consistent Green’s function calculations of the closed shell nuclei 4He, 16O and 40Ca, based on two-nucleon potentials derived from Lattice QCD simulations, in the flavor SU(3) limit and at the pseudo-scalar meson mass of 469 MeV/c 2 . The nucleon-nucleon interaction is obtained using the HAL QCD method and its short-distance repulsion is treated by means of ladder resummations outside the model space. Our results show that this approach diagonalises ultraviolet degrees of freedom correctly. Therefore, ground state energies can be obtained from infrared extrapolations even for the relatively hard potentials of HAL QCD. Comparing to previous Brueckner Hartree-Fock calculations, the total binding energies are sensibly improved by the full account of many-body correlations. The results suggest an interesting possible behaviour in which nuclei are unbound at very large pion masses and islands of stability appear at first around the traditional doublymagic numbers when the pion mass is lowered toward its physical value. The calculated one-nucleon spectral distributions are qualitatively close to those of real nuclei even for the pseudo-scalar meson mass considered here.