Single-Particle Theory of Fission
نویسنده
چکیده
The single-particle aspects of nuclear fission theories are investigated. The liquid drop model is shown to be essentially equivalent to an independent particle model with the requirement that particles occupy the lowest orbits. The consequences of relaxing this requirement are pursued and are shown to be significant. A natural framework is provided in which the mass asymmetry of fission arises naturally. A report is given of the technical aspects and the quantitative results of a detailed model calculation. Some of the indicated conclusions are formulated as phenomenological rules.
منابع مشابه
FISSION FRAGMENT ANGULAR ANISOTROPIES AND INERTIA PARAMETERS
An analysis of selected fission fragment angular distributions from helium-ion induced fission is made using an exact theoretical expression. Theoretical anisotropies obtained with the transition state model are compared with their corresponding values deduced from the statistical scission model. The nuclear moment of inertia extracted from the model calculations are compared with their est...
متن کاملTheory of Charge Dispersion in Nuclear Fissioii
F o r the distribution of nuclear charge in fission, a number of empirical hypotheses such a s that of equal charge distribution, unchanged charge density, and minimum potential energy have been proposed in the past by various authors.' Only recently, Holub, Mustafa, and Schmitt2 have calculated the potential energy sur face fo r the charge vibration in 236U by using the two-spheroid liquid-dro...
متن کاملSemiclassical Interpretation of the Mass Asymmetry in Nuclear Fission
We give a semiclassical interpretation of the mass asymmetry in the fission of heavy nuclei. Using only a few classical periodic orbits and a cavity model for the nuclear mean field, we reproduce the onset of left-right asymmetric shapes at the fission isomer minimum and the correct topology of the deformation energy surface in the region of the outer fission barrier. We point at the correspond...
متن کاملFission of heavy Λ hypernuclei with the Skyrme-Hartree-Fock approach
Fission-related phenomena of heavy Λ hypernuclei are discussed with the constraint Skyrme-Hartree-Fock+BCS (SHF+BCS) method, in which a similar Skyrme-type interaction is employed also for the interaction between a Λ particle and a nucleon. Assuming that the Λ particle adiabatically follows the fission motion, we discuss the fission barrier height of 239 ΛU. We find that the fission barrier hei...
متن کاملSemiclassical Calculation of Shell Effects in Deformed Nuclei
The explanation of the asymmetry in the fragment mass distributions of many actinide nuclei has long been a stumblestone in fission theory. Shortly after the advent of the shell model, Lise Meitner related the mass asymmetry to shell structure, in particular to magic nucleon numbers in one of the fragments. Indeed, since the classical liquid drop model (LDM) prefers symmetric shapes, the mass a...
متن کامل