Chiral three-nucleon forces and the evolution of correlations along the oxygen isotopic chain Article Swipe
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· 2015
· Open Access
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· DOI: https://doi.org/10.1103/physrevc.92.014306
· OA: W2249096513
The impact of three-nucleon forces (3NFs) along the oxygen chain is\ninvestigated for the spectral distribution for attachment and removal of a\nnucleon, spectroscopic factors and matter radii. We employ self-consistent\nGreen's function (SCGF) theory which allows a comprehensive calculation of the\nsingle particle spectral function. For the closed subshell isotopes, $^{14}$O,\n$^{16}$O, $^{22}$O, $^{24}$O and $^{28}$O, we perform calculations with the\nDyson-ADC(3) method. The remaining open shell isotopes are studied using the\nnewly developed Gorkov-SCGF formalism up to second order. We produce plots for\nthe full-fledged spectral distributions. The spectroscopic factors for the\ndominant quasiparticle peaks are found to depend very little on the leading\norder (NNLO) chiral 3NFs. The latters have small impact on the calculated\nmatter radii, which, however are consistently obtained smaller than experiment.\nSimilarly, single particle spectra tend to be diluted with respect to\nexperiment. This effect might hinder, to some extent, the onset of correlations\nand screen the quenching of calculated spectroscopic factors. The most\nimportant effects of 3NFs is thus the fine tuning of the energies for the\ndominant quasiparticle states, which govern the shell evolution and the\nposition of driplines. Although present chiral NNLO 3NFs interactions do\nreproduce the binding energies correctly in this mass region, the details of\nthe nuclear wave function remain at odd with the experiment showing too small\nradii and a too dilute single particle spectrum, similar to what already\npointed out for larger masses. This suggests a lack of repulsion in the present\nmodel of NN+3N interactions which is mildly apparent already for masses in the\nA=14--28 range.\n
