Benchmark calculations of pure neutron matter with realistic nucleon-nucleon interactions. (arXiv:1908.04426v1 [nucl-th])

Benchmark calculations of pure neutron matter with realistic nucleon-nucleon interactions. (arXiv:1908.04426v1 [nucl-th])
<a href="http://arxiv.org/find/nucl-th/1/au:+Piarulli_M/0/1/0/all/0/1">M. Piarulli</a>, <a href="http://arxiv.org/find/nucl-th/1/au:+Bombaci_I/0/1/0/all/0/1">I. Bombaci</a>, <a href="http://arxiv.org/find/nucl-th/1/au:+Logoteta_D/0/1/0/all/0/1">D. Logoteta</a>, <a href="http://arxiv.org/find/nucl-th/1/au:+Lovato_A/0/1/0/all/0/1">A. Lovato</a>, <a href="http://arxiv.org/find/nucl-th/1/au:+Wiringa_R/0/1/0/all/0/1">R. B. Wiringa</a>

We report benchmark calculations of the energy per particle of pure neutron
matter as a function of the baryon density using three independent many-body
methods: Brueckner-Bethe-Goldstone, Fermi hypernetted chain/single-operator
chain, and auxiliary-field diffusion Monte Carlo. Significant technical
improvements are implemented in the latter two methods. The calculations are
made for two distinct families of realistic coordinate-space nucleon-nucleon
potentials fit to scattering data, including the standard Argonne $v_{18}$
interaction and two of its simplified versions, and four of the new Norfolk
$Delta$-full chiral effective field theory potentials. The results up to twice
nuclear matter saturation density show some divergence among the methods, but
improved agreement compared to earlier work. We find that the potentials fit to
higher-energy nucleon-nucleon scattering data exhibit a much smaller spread of
energies.

We report benchmark calculations of the energy per particle of pure neutron
matter as a function of the baryon density using three independent many-body
methods: Brueckner-Bethe-Goldstone, Fermi hypernetted chain/single-operator
chain, and auxiliary-field diffusion Monte Carlo. Significant technical
improvements are implemented in the latter two methods. The calculations are
made for two distinct families of realistic coordinate-space nucleon-nucleon
potentials fit to scattering data, including the standard Argonne $v_{18}$
interaction and two of its simplified versions, and four of the new Norfolk
$Delta$-full chiral effective field theory potentials. The results up to twice
nuclear matter saturation density show some divergence among the methods, but
improved agreement compared to earlier work. We find that the potentials fit to
higher-energy nucleon-nucleon scattering data exhibit a much smaller spread of
energies.

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