Superfluidity in neutron matter and nuclear matter with realistic interactions

3P2−3F2Baldo1, Elgarøy2, Engvik3 et al. 1998Phys. Rev. CSelf Cite15481971View full textAdd to dashboardCite

“…The results of different groups are in close agreement on the 1 S 0 pairing gap values and on its density dependence, which shows a peak value of about 3 MeV at a Fermi momentum close to k F ≈ 0.8 fm −1 [2][3][4][5]. All these calculations adopt the bare NN interaction as the pairing force, and it has been pointed out that the screening by the medium of the interaction could strongly reduce the pairing strength in this channel [5][6][7].…”

“…The latter can be solved for the coefficients of the expansion by iteration, following the scheme described in Ref. [2]. The rank n of the separable form is increased until a high degree of convergence is reached.…”

Spatial dependence of the pairing gap in superfluid nuclei

“…For any given value of R c.m. , the pairing gap decreases as a function of k: this is in keeping with the behaviour of the pairing gap ∆(k) at a given density in infinite matter [5], and is related to the behaviour of the experimental phase shift in the 1 S 0 channel" which decreases monotonously as a function of the relative momentum, until it becomes negative for k ∼ 1.7 fm −1 . It is useful to make a semiclassical approximation, plotting the quantity…”

Critical enhancement of the in-medium nucleon-nucleon cross section at low temperatures

“…ref. [12] and references therein). The ladder approximation for the thermodynamical Tmatrix gives on one hand side the in-medium cross sections at finite temperatures, on the other hand side it permits the determination of the critical temperature for the superfluid phase transition (Thouless criterion [13]).…”