Dynamical Simulation of Emission Angle Dependence of Fragments Spin in Heavy Ion Fusion–fission Reactions

Abstract

In this paper, a formalism consisting of multi-dimensional Langevin equation (LE) and Scission point Transition State Model (SCTSM) have been applied to study the angle dependence of fragment's average spin for 16 O + 209 Bi and 16 O + 232 Th systems. The influence of asymmetry and deformation parameters, neck thickness of compound nucleus and pre-scission neutron multiplicity on the fragment's average spin is discussed. Results obtained using this approach are in better agreement with the experimental data as compared with the SCTSM.

Investigation of fission fragments average spin based on four dimensional Langevin dynamical model

“…In the present paper the transition state model and four dimensional Langevin approach are applied to study the gamma multiplicity and average spin of fission fragments in the reactions 18 O+ 208 Pb, 16 Solid and open circles are experimental data [20] and obtained results based on the four dimensional dynamical model, respectively. The curve is an approximation of theory by a polynomial of second order.…”

“…3 that the dynamical calculation of the average spin of fission fragments is in better agreement with the experimental data. For better comparison between the results of the dynamical model and experimental data and also investigating the angular dependence of average total spin of the fission fragments, we calculated the average fragment spin as a function of bombarding energy for 16 O + 232 Th and 12 C + 232 Th reactions, respectively, in Figs. 4 and 5 for angles 90 • and 165 • .…”

“…In the last two decades the stochastic model [11][12][13][14][15][16][17] has been engaged to successfully reproduce a great number of experimental data on prescission particle multiplicities and evaporation residue cross sections for a lot of compound systems over a wide range of excitation energy, angular momentum, and fissility. The Langevin equations in one, two, three and four dimensions have been applied to calculate the angular distribution of fis-sion fragments, mass distribution, kinetic energy, fission probability, and fission cross section.…”