Abstract.
We explore the lattice spacing dependence in Nuclear Lattice Effective Field Theory for few-body systems up to next-to-next-to leading order in chiral effective field theory including all isospin breaking and electromagnetic effects, the complete two-pion-exchange potential, and the three-nucleon forces. We calculate phase shifts in the neutron-proton system and proton-proton systems as well as the scattering length in the neutron-neutron system. We then perform a full next-to-next-to-leading order calculation with two-nucleon and three-nucleon forces for the triton and helium-4, and analyse their binding energy correlation. We show how the Tjon band is reached by decreasing the lattice spacing, and confirm the continuum observation that a four-body force is not necessary to describe light nuclei.
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Klein, N., Elhatisari, S., Lähde, T.A. et al. The Tjon band in Nuclear Lattice Effective Field Theory. Eur. Phys. J. A 54, 121 (2018). https://doi.org/10.1140/epja/i2018-12553-y
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DOI: https://doi.org/10.1140/epja/i2018-12553-y