Asymmetry dependence of the caloric curve for mononuclei

The asymmetry dependence of the caloric curve, for mononuclear configurations, is studied as a function of neutron-to-proton asymmetry with a model that allows for independent variation of the neutron and proton surface diffusenesses. The evolution of the effective mass with density and excitation is included in a schematic fashion and the entropies are extracted in a local density approximation. The plateau in the caloric curve displays only a slight sensitivity to the asymmetry.

Figure 1

(Top) Expansion energy, $\varepsilon (b_n,b_p)$ for $\delta =0.21154$ and 0.4. (Bottom) $s(b_n,b_p)$ maps for $\varepsilon =1$, 2, 3, 4, and 5 MeV.

Figure 2

(Top) Caloric curves for $\delta =0.1$ (triangles), 0.21154 (squares), 0.3 (circles), and 0.4 (diamonds). The equilibrium neutron (dashed) and proton (dotted) surface widths are also shown for $\delta =0.21154$.