Entrance-channel effects on the average angular momentum of compound nuclei produced in fusion reactions

Haas et al. recently observed a strong entrance-channel dependence in the angular momentum content of compound nuclei produced in fusion reactions. We explain the origin of these effects and analyze the cases of ${}_{}{}^{16}{}_{}{}^{}$O${+\mathrm{}}^{144}$Nd, ${}_{}{}^{37}{}_{}{}^{}$Cl${+\mathrm{}}^{123}$Sb, ${}_{}{}^{64}{}_{}{}^{}$Ni${+\mathrm{}}^{96}$Zr, and ${}_{}{}^{80}{}_{}{}^{}$Se${+\mathrm{}}^{80}$Se presented by Haas et al.