  Mass-angle correlation of fission fragments has been understood as
manifestation of quasifission. We show that this is not so: the effect can
originate from correlation between fusion-fission amplitudes with different
total spins signifying matter-wave interference in compound nucleus processes.
This resolves the well-known puzzle with the mass-angle correlation in the
complete fusion sub-barrier reaction $^{16}$O+$^{238}$U. Our finding is
important for more reliable predictions of production cross sections for
superheavy elements. Matter-wave interference also produces quantum-classical
transition to the time-orientation localization of the coherently rotating
dinucleus in quasifission.
