Computational Study of Scission Neutrons in Low-Energy Fission: Stationary and Time-Dependent Approaches
Langue
en
Article de revue
Ce document a été publié dans
Communications in Computational Physics. 2011-04, vol. 9, p. 917-936
Global Science Press
Résumé en anglais
The emission of scission neutrons from fissioning nuclei is of high practical interest. To study this process we have used the sudden approximation and also a more realistic approach that takes into account the scission ...Lire la suite >
The emission of scission neutrons from fissioning nuclei is of high practical interest. To study this process we have used the sudden approximation and also a more realistic approach that takes into account the scission dynamics. Numerically, this implies the solution of the bi-dimensional Schrodinger equation, both stationary and time-dependent. To describe axially symmetric extremely deformed nuclear shapes, we have used the Cassini parametrization. The Hamiltonian is discretized by using finite difference approximations of the derivatives. The main computational challenges are the solution of algebraic eigenvalue problems and of linear systems with large sparse matrices. We have employed appropriate procedures (Arnoldi and bi-conjugate gradients). The numerical solutions have been used to evaluate physical quantities, like the number of emitted neutrons per scission event, the primary fragments' excitation energy and the distribution of the emission points.< Réduire
Mots clés en anglais
non-standard finite differences
Mots clés en italien
Scission neutrons
fission
bi-dimensional Schrodinger equation
stationary
time-dependent
non-standard finite differences.
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