Neutron matter at low density and the unitary limit
- Dipartimento di Fisica, Universita di Catania and INFN, Sezione di Catania Via S. Sofia 64, I-95123, Catania (Italy)
Neutron matter at low density is studied within the hole-line expansion. Calculations are performed in the range of Fermi momentum k{sub F} between 0.4 and 0.8 fm{sup -1}. It is found that the Equation of State is determined by the {sup 1}S{sub 0} channel only, the three-body forces contribution is quite small, the effect of the single particle potential is negligible and the three hole-line contribution is below 5% of the total energy and indeed vanishing small at the lowest densities. Despite the unitary limit is actually never reached, the total energy stays very close to one half of the free gas value throughout the considered density range. A rank one separable representation of the bare NN interaction, which reproduces the physical scattering length and effective range, gives results almost indistinguishable from the full Brueckner G-matrix calculations with a realistic force. The extension of the calculations below k{sub F}=0.4 fm{sup -1} does not indicate any pathological behavior of the neutron matter equation of state.
- OSTI ID:
- 21068079
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 77, Issue 1; Other Information: DOI: 10.1103/PhysRevC.77.015801; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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