Variational calculation of nuclear matter in finite particle number approach using unitary correlation operator and high-momentum pair methods

Abstract

We propose a new variational method for describing nuclear matter from nucleon-nucleon interaction. We use the unitary correlation operator method (UCOM) for central correlation to treat the short-range repulsion and further include the two-particle two-hole (2p2h) excitations of nucleon pair involving a large relative momentum, which is called 'high-momentum pair'(HM). We describe nuclear matter in finite size with finite particle number on periodic boundary condition and increase the 2p2h configurations until we get the convergence of the total energy per particle. We demonstrate the validity of this 'UCOM+HM' framework by applying it to the symmetric nuclear and neutron matters with the Argonne V4${}^{\prime }$ potential having short-range repulsion. The nuclear equations of state obtained in UCOM+HM are fairly consistent to those of other calculations such as Brueckner-Hartree-Fock and auxiliary field diffusion Monte Carlo in the overall density region.

12 pages, 24 figures

References in corpus (7)

• Quantum Monte Carlo calculation of the equation of state of neutron matter
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• Density-dependent nucleon-nucleon interaction from three-nucleon forces
• Improved version of simplified method for including tensor effect in cluster models
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Cited by in corpus (3)

• Finite particle number description of neutron matter using the unitary correlation operator and high-momentum pair methods
• New many-body method using cluster expansion diagrams with tensor-optimized antisymmetrized molecular dynamics
• Finite particle-number description of symmetric nuclear matter with spin excitations of high-momentum pairs induced by tensor force