Benchmark calculations of pure neutron matter with realistic nucleon-nucleon interactions

Piarulli, M.; Bombaci, I.; Logoteta, D.; Lovato, A.; Wiringa, R. B.

doi:10.1103/PhysRevC.101.045801

Title: Benchmark calculations of pure neutron matter with realistic nucleon-nucleon interactions

Journal Article · Wed Apr 08 00:00:00 EDT 2020 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.101.045801· OSTI ID:1630077

Piarulli, M. ^[1];

^[2]; Logoteta, D. ^[2]; Lovato, A. ^[3]; Wiringa, R. B. ^[4]

Washington Univ., St. Louis, MO (United States)
Univ. di Pisa (Italy); Istituto Nazionale di Fisica Nucleare (INFN),Pisa (Italy)
Argonne National Lab. (ANL), Argonne, IL (United States); Trento Inst. of Fundamental Physics and Applications (TIFPA) (Italy)
Argonne National Lab. (ANL), Argonne, IL (United States)

Here, 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 v₁₈ interaction and two of its simplified versions, and four of the new Norfolk Δ -full chiral effective field theory potentials. Primarily because of the advancements in the auxiliary-field diffusion Monte Carlo, we observe good agreement among the three many-body techniques up to nuclear saturation density—the maximum difference in the energy per particle is within 1.5 MeV for all the potentials we consider. At higher densities, the divergences become more important, and are mainly driven by the Fermi hypernetted chain/single-operator calculations. We also study the connection between nucleon-nucleon scattering data and the energy per particle of pure neutron matter. Our results suggest that fitting to higher-energy nucleon-nucleon scattering helps reduce the spread of energies among the models.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); FRIB Theory Alliance

Grant/Contract Number:: AC02-06CH11357; SC0013617

OSTI ID:: 1630077

Alternate ID(s):: OSTI ID: 1617699

Journal Information:: Physical Review C, Vol. 101, Issue 4; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 37 works

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
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Title: Benchmark calculations of pure neutron matter with realistic nucleon-nucleon interactions

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