Abstract.
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 \(0 < k_{F} \leq 1.75\) fm-1, using the Argonne \(v_{18}\) 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 \(\leq k_{F} \leq\) 0.285 fm-1, corresponding to mass densities between \( 10^{11.4}\) and \( 10^{12.4}\) 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.
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Arellano, H.F., Delaroche, JP. Low-density homogeneous symmetric nuclear matter: Disclosing dinucleons in coexisting phases. Eur. Phys. J. A 51, 7 (2015). https://doi.org/10.1140/epja/i2015-15007-2
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DOI: https://doi.org/10.1140/epja/i2015-15007-2