Spin-isospin structure and pion condensation in nucleon matter

Journal Article · Wed Oct 01 04:00:00 EDT 1997 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.56.2261· OSTI ID:542730

Akmal, A; Pandharipande, V R ^[1]

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1. Department of Physics, University of Illinois at Urbana-Champaign, 1110 W. Green St., Urbana, Illinois 61801 (United States)

We report variational calculations of symmetric nuclear matter and pure neutron matter, using the new Argonne v{sub 18} two-nucleon and Urbana IX three-nucleon interactions. At the equilibrium density of 0.16 fm{sup {minus}3} the two-nucleon densities in symmetric nuclear matter exhibit a short-range spin-isospin structure similar to that found in light nuclei. We also find that both symmetric nuclear matter and pure neutron matter undergo transitions to phases with pion condensation at densities of 0.32 fm{sup {minus}3} and 0.2 fm{sup {minus}3}, respectively. Neither transtion occurs with the Urbana v{sub 14} two-nucleon interaction, while only the transition in neutron matter occurs with the Argonne v{sub 14} two-nucleon interaction. The three-nucleon interaction is required for the transition to occur in symmetric nuclear matter, whereas the transition in pure neutron matter occurs even in its absence. The behavior of the isovector spin-longitudinal response and the pion excess in the vicinity of the transition, and the model dependence of the transition are discussed. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 542730
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 4 Vol. 56; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CONDENSATES
EQUILIBRIUM
ISOSPIN
MANY-BODY PROBLEM
NEUTRONS
NUCLEAR MATTER
PHASE TRANSFORMATIONS
PIONS
SPIN
VARIATIONAL METHODS