Abstract
Investigates the nature and properties of the delta resonance, Delta (1236), in infinite nuclear and neutron matter, performing calculations of the potential energy of a system of separate Fermi seas of nucleons and delta resonances, using Jastrow lowest-order constrained variational techniques The author uses the Reid soft-core nucleon-nucleon interaction and a model, consistent, energy-dependent, static one-pion- and one-rho-meson-exchange nucleon-delta potential, and find a significant reduction in the potential energy of the system at densities above nuclear matter density (0.17 fm-3) when deltas are present. The author estimates the density at which the formation of a separate Fermi sea of deltas is favourable, and discuss the consequences for the possible formation of a pion condensate and the properties of neutron star matter.
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