https://doi.org/10.1140/epja/i2014-14013-2
Regular Article - Theoretical Physics
Tensor force effects and high-momentum components in the nuclear symmetry energy
1
Department d’Estructura i Constituents de la Matèria and Institut de Ciències del Cosmos, Facultat de Física, Universitat de Barcelona, E-08028, Barcelona, Spain
2
Centro de Física Computacional, Department of Physics, University of Coimbra, PT-3004-516, Coimbra, Portugal
3
Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, GU2 7XH, Guilford, UK
* e-mail: a.rios@surrey.ac.uk
Received:
6
August
2013
Revised:
6
September
2013
Accepted:
9
September
2013
Published online:
25
February
2014
We analyze microscopic many-body calculations of the nuclear symmetry energy and its density dependence. The calculations are performed in the framework of the Brueckner-Hartree-Fock and the self-consistent Green’s functions methods. Within Brueckner-Hartree-Fock, the Hellmann-Feynman theorem gives access to the kinetic energy contribution as well as the contributions of the different components of the nucleon-nucleon interaction. The tensor component gives the largest contribution to the symmetry energy. The decomposition of the symmetry energy in a kinetic part and a potential energy part provides physical insight on the correlated nature of the system, indicating that neutron matter is less correlated than symmetric nuclear matter. Within the self-consistent Green’s function approach, we compute the momentum distributions and we identify the effects of the high momentum components in the symmetry energy. The results are obtained for the realistic interaction Argonne V18 potential, supplemented by the Urbana IX three-body force in the Brueckner-Hartree-Fock calculations.
© SIF, Springer-Verlag Berlin Heidelberg, 2014
