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Average angular momenta deduced from isomer ratio, gamma-multiplicity, and fission fragment angular anisotropy measurements, and the associated cross sections for fourteen systems are analyzed with a barrier penetration model that includes the coupling of inelastic channels. Good agreement was found between the theory and the data obtained from isomer ratio and from gamma-ray multiplicity measurements with the exception of the more symmetric systems. In these cases the discrepancies with theory show correlations in cross section and angular momentum suggesting that a valid model can be found. The measurements of angular momentum using the fission fragment anisotropy technique, however, do not appear reconcilable with the energy dependence of the cross sections. This systematic overview suggests that the origin of this discrepancy lies with the deduction of angular momentum from the measured anisotropy in inclusive fission fragment angular distributions.

Systematic analysis of average angular momenta and cross sections in sub-barrier fusion