https://doi.org/10.1051/epjconf/202125600004
Multiplicity of scision neutrons from density functional scission dynamics
1 Joint Institute of Nuclear Research, Dubna, Russia
2 “Horia Hulubei” National Institute for Physics and Nuclear Engineering, Bucharest, Romania
3 Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
4 Department of Physics, University of Washington, Seattle, Washington 98195, USA
* e-mail: carjan@theory.nipne.ro
Published online: 15 December 2021
The time evolution of the nuclear density of the fissioning system 240Pu during the scission process is obtained from the time-dependent superfluid local-density approximation (TDSLDA) to the density functional theory. A nuclear energy density functional based on the Skyrme force Skm* is used. The duration of the scission process Δt as well as the neck radius (rmin) of the ‘just-before scission’ configuration and the minimum separation (dmin) of the inner surfaces of the fragments in the ’immediately-after scission’ configuration were extracted in order to calculate the multiplicity of the scission neutrons (Vsc) using a phenomenological dynamical scission model (DSM). We find that Vsc=1.347, i.e. half of the prompt fission neutrons measured in the reaction 239Pu(nth; f) are released at scission. After scission, the fragments are left excited and with some extra deformation energy (mainly the heavy one). In this way we can account for the evaporation of the other half and for the emission of γ rays.
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
