Low density Neutron Matter at Finite and Zero Temperatures
نویسنده
چکیده
This report concerns the energy of neutron-matter for densities below 0.15fm and temperatures at and below 10MeV . Separable NN-interactions are obtained by inverse scattering from the experimental phase-shifts with specified momentum cut-offs Λ. Results of Brueckner-Bloch-DeDomicis as well as finite temperature Green’s function calculations show independence of cut-off for Λ ≥ 3. Agreement with the low-density virial expansion is found. Results of Hartree-Fock as well as second order calculations show considerable Λ-dependence and the agreement with the virial expansion is lost. The ”best” first-order choice of Λ is found to be ∼ 2.5fm, which agrees with Vlow k studies. Reasonable agreement between the second order and the Brueckner results is also found for this value of Λ except at low density. Only 2-body forces are used in this study.
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