Effects of angular correlations on particle-particle propagation in infinite nuclear matter

19th Chilean Physics Symposium 2014

Romero-Barrientos, J.^1 ; Arellano, H.F.^1

Departamento de Física - FCFM, Universidad de Chile, Av. Blanco Encalada 2008, Santiago, Chile^1

关键词: Angular correlations;    Angular dependence;    Energy denominators;    Particle propagation;    Perturbative approach;    Saturation properties;    Self-consistent solution;    Single particle;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/720/1/012022/pdf
DOI  :  10.1088/1742-6596/720/1/012022

来源: IOP

【 摘 要 】

The effect of angular correlations on self-consistent solutions for single-particle (sp) potentials in infinite nuclear matter is investigated. To this end we treat explicitly the angular dependence of the particle-particle (pp) propagator in Brueckner-Hartree-Fock (BHF) equation for the g matrix. It is observed that the exact angular dependence of the pp propagator yields highly fluctuating structures, posing stringent difficulties in the actual search of self-consistent solutions for the sp energy. A perturbative approach is presented to evaluate the effect of the angular correlations in the self-consistent solutions. Solutions at Fermi momenta kFin the range 1.20 - 1.75 fm-1are reported using Argonne v18nucleon- nucleon potential. Although the sp potentials are sensitive to the treatment of the angular behaviour of the propagator, such sensitivity appears at momenta well above the Fermi surface. As a result, the saturation properties of symmetric nuclear matter differ marginally from those calculated using angle-averaged energy denominators in pp propagators.