Catapult neutrons from neck snapping in fission
Phys. Rev. C 114, 024613 – Published 31 August, 2026
DOI: https://doi.org/10.1103/pfz5-4r78
Abstract
Dynamical fission calculations show that the post-scission configurations resemble two collinear pear-shaped fragments whose juxtaposed surface bulges subside relatively quickly, as the fragments acquire smoother shapes. The associated rapid speed of the healing bulge surface may boost nucleons in the fragment to energies sufficient for emission. The present study explores this mechanism by following the fate of nucleons that are reflected off the inwards moving bulge surface. The simulations suggest that the mechanism may produce high-energy neutrons at the level of a few percent.
