2021/10/19 by Rui Han, R. Han, M. Warda +2
Chemistry · Engineering · Physics and Astronomy · #Ab initio #Atomic physics #Bond cleavage #Chemistry #Discontinuity (linguistics) #Fission #Molecular physics #Neutron #Nuclear fission #Nuclear physics #Nuclear physics research studies #Nuclear reactor physics and engineering #Physics #Potential energy surface #Quadrupole #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #RADIUS #Saturation (graph theory) #nucl-th
paper · pdf · doi:10.1103/physrevc.104.064602
13 pages, 12 figures, submitted to Phys Rev C
arxiv created 2021/10/19 · openalex publication_date 2021/12/02 · arxiv updated 2021/12/15 · openalex created_date 2021/12/31 · openalex updated_date 2026/07/23
The calculations of the potential-energy surface are essential in the theoretical description of the fission process. In the constrained self-consistent approach, the smooth evolution of nuclear shape is described from the ground state until a very elongated one with a narrow neck. In all microscopic calculations, the rupture of the neck at scission is associated with a substantial change of nuclear matter density distribution and rapid energy decrease. In this paper, we show that there is no discontinuity of the potential-energy surface at scission when multiconstrained calculations are applied with the neck constraint. An early rupture of the neck at lower quadrupole and octupole moments is discussed as competitive with the conventional fission path. We discuss the neck properties in the scission configuration. We find that the neck radius in the asymmetric fission mode cannot decrease below 2 fm, and the nuclear matter density cannot decrease below the saturation density. In the compact fission mode, nuclear density may go down to half of the saturation density before the rupture of the neck.