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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