| 1. |
- Ekstrom, A., et al.
(author)
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Accurate nuclear radii and binding energies from a chiral interaction
- 2015
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In: Physical Review C - Nuclear Physics. - 2469-9985 .- 2469-9993. ; 91:5
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Journal article (peer-reviewed)abstract
- With the goal of developing predictive ab initio capability for light and medium-mass nuclei, two-nucleon and three-nucleon forces from chiral effective field theory are optimized simultaneously to low-energy nucleon-nucleon scattering data, as well as binding energies and radii of few-nucleon systems and selected isotopes of carbon and oxygen. Coupled-cluster calculations based on this interaction, named NNLOsat, yield accurate binding energies and radii of nuclei up to Ca-40, and are consistent with the empirical saturation point of symmetric nuclear matter. In addition, the low-lying collective J(pi) = 3(-) states in O-16 and 40Ca are described accurately, while spectra for selected p- and sd-shell nuclei are in reasonable agreement with experiment.
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| 2. |
- Ekstrom, A., et al.
(author)
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Statistical uncertainties of a chiral interaction at next-to-next-to leading order
- 2015
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In: Journal of Physics G: Nuclear and Particle Physics. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 42:3
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Journal article (peer-reviewed)abstract
- We have quantified the statistical uncertainties of the low-energy coupling-constants (LECs) of an optimized nucleon-nucleon interaction from chiral effective field theory at next-to-next-to-leading order. In addition, we have propagated the impact of the uncertainties of the LECs to two-nucleon scattering phase shifts, effective range parameters, and deuteron observables.
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| 3. |
- Karlsson, Boris, 1987
(author)
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Making predictions using χEFT
- 2015
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Licentiate thesis (other academic/artistic)abstract
- In this thesis we explore the merits of chiral effective field theory (χEFT) as a model for low-energy nuclear physics. χEFT is an effective field theory based on quantum chromo dynamics (QCD) describing low-energy interactions of nucleons and pions. We estimate the inherent uncertainties of χEFT and the accompanying methods used to compute observables in order to test the predictive power of the model. We use experimental pion-nucleon, nucleon- nucleon and few-nucleon data to perform a simultaneous fit of the low-energy constants in χEFT. This results in small statistical uncertainties in the model. The results show a clear order-by-order improvement of χEFT with the systematical model error dominating the total error budget.
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