Anomalous anisotropies of fission fragments for sub-barrier fusion-fission reactions

It is shown that preequilibrium fission can give rise to a large anisotropy at sub-barrier energies for the $^{16}\mathrm{O}$${+}^{232}$Th and $^{12}\mathrm{C}$${+}^{236}$U reactions, since the transmission coefficient is several times larger for target orientation angles around 180\ifmmode^\circ\else\textdegree\fi{} in comparison with angles around 90\ifmmode^\circ\else\textdegree\fi{}. At higher energies the effect dilutes, since the transition probability becomes of approximately equal magnitude for all orientations.

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