https://doi.org/10.1140/epja/i2015-15007-2
Regular Article - Theoretical Physics
Low-density homogeneous symmetric nuclear matter: Disclosing dinucleons in coexisting phases
1
Department of Physics, University of Chile, Av. Blanco Encalada 2008, Santiago, Chile
2
CEA, DAM, F-91297, Arpajon, France
* e-mail: arellano@dfi.uchile.cl
Received:
27
October
2014
Revised:
12
January
2015
Accepted:
14
January
2015
Published online:
28
January
2015
The effect of in-medium dinucleon bound states on self-consistent single-particle fields in Brueckner, Bethe and Goldstone theory is investigated in symmetric nuclear matter at zero temperature. To this end, dinucleon bound state occurences in the 1
S
0 and 3
SD
1 channels are explicitly accounted for --within the continuous choice for the auxiliary fields-- while imposing self-consistency in Brueckner-Hartree-Fock approximation calculations. Searches are carried out at Fermi momenta in the range fm-1, using the Argonne
bare nucleon-nucleon potential without resorting to the effective-mass approximation. As a result, two distinct solutions meeting the self-consistency requirement are found with overlapping domains in the interval 0.130 fm-1
0.285 fm-1, corresponding to mass densities between
and
g cm-3. Effective masses as high as three times the nucleon mass are found in the coexistence domain. The emergence of superfluidity in relationship with BCS pairing gap solutions is discussed.
© SIF, Springer-Verlag Berlin Heidelberg, 2015