\begin{document}$ ^{236} $\end{document}U using covariant density functional theory with constraints on the axial quadrupole and octupole deformations \begin{document}$ (\beta_2, \beta_3) $\end{document} as well as the nucleon number in the neck \begin{document}$ q_N $\end{document}. By considering the additional degree of freedom \begin{document}$ q_N $\end{document}, the coexistence of the elongated and compact fission modes is predicted for \begin{document}$ 0.9\lesssim \beta_3 \lesssim 1.3 $\end{document}. Remarkably, the PES becomes shallow across a large range of quadrupole and octupole deformations for small \begin{document}$ q_N $\end{document}, and consequently, the scission line in the \begin{document}$ (\beta_2, \beta_3) $\end{document}plane extends to a shallow band, leading to fluctuations of several to ten MeV in the estimated total kinetic energies and of several to approximately ten nucleons in the fragment masses."> Three-dimensional potential energy surface for fission of <sup>236</sup>U within covariant density functional theory -
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