LBL-1 0911 c La renee Berkeley Laboratory UNIVERSITY OF CALIFORNIA Presented at the Nobel Symposium on High-Spin States, Orenas, Sweden, June 22-25, 1980; and submitted to Physica Scripta THE DYNAMICS OF NUCLEAR COALESCENCE OR RESEPARATION W. J. Swiatecki June 1980 TWO-WEEK LOAN COPY This is a Library Circulating Copy which may be borrowed for two weeks. For a personal retention copy, call Tech. Info. Diu is ion, Ext. 6782 o i \ !(:·(··, t.:· 1 ·v -~::; Y ) • •• u .... LAWF<ENCE f3ER!\ELEY LABOf·<Al ORY AUG 18 1980 Prepared for the U.S. Department of Energy under Contract W-7405-ENG-48

The dynamics of nuclear coalescence or reseparation

Radioactive decay of nuclei via emission of $\alpha$ particles has been studied theoretically in the framework of a superasymmetric fission model using the double folding (DF) procedure for obtaining the $\alpha$-nucleus interaction potential. The DF nuclear potential has been obtained by folding in the density distribution functions of the $\alpha$ nucleus and the daughter nucleus with a realistic effective interaction. The M3Y effective interaction has been used for calculating the nuclear interaction potential which has been supplemented by a zero-range pseudo-potential for exchange along with the density dependence. The nuclear microscopic $\alpha$-nucleus potential thus obtained has been used along with the Coulomb interaction potential to calculate the action integral within the WKB approximation. This subsequently yields microscopic calculations for the half lives of $\alpha$ decays of nuclei. The density dependence and the exchange effects have not been found to be very significant. These calculations provide reasonable estimates for the lifetimes of $\alpha$ radioactivity of nuclei.

Folding model analysis of alpha radioactivity

Alpha and cluster decay of some deformed heavy and superheavy nuclei

Alpha decay half lives of spherical even-even nuclei: Role of repulsive core

Anisotropy of the angular distribution of fission fragments in heavy-ion fusion-fission reactions: The influence of the level-density parameter and the neck thickness

A stochastic approach to fission dynamics based on one- and three-dimensional Langevin equations was applied to calculate the fission probability and the pre-scission particle multiplicity. Evaporation of pre-scission light particles along Langevin fission trajectories from the ground state of the compound nucleus to its scission and fission probability have been calculated using a Monte Carlo simulation technique. To examine this approach we used $^{19}\mathrm{F}+^{181}\mathrm{Ta}$ and $^{16}\mathrm{O}+^{197}\mathrm{Au}$ systems. Our results show that the fission probability and pre-scission particle multiplicity in three dimensions is different from the one-dimensional Langevin approach. The theoretical results of pre-scission neutron, proton, and $\ensuremath{\alpha}$-particle multiplicities and the fission probability for given systems based on this model are compared with available experimental data. The obtained results using three-dimensional calculations are in better agreement with experimental data.

Influence of dynamical parameters on pre-scission particles and fission probability in heavy-ion collisions

Coupled Langevin equations and Monte Carlo simulation were used to calculate the fusion cross-section in heavy-ion fusion-fission reactions. The effect of dynamical parameters on the distance of centers of two colliding nuclei is also investigated. Attention was focused on incident energies around the fusion barrier where measured values do not agree with results of different models. The calculations are done for typical systems. Finally, the results of the dynamical approach are compared with experimental data and the results obtained using the CCFULL code. The obtained results of the dynamical model are in satisfactory agreement with experimental data.

Study of fusion cross-section in heavy-ion fusion-fission reactions at around fusion barrier energies using the Langevin dynamical approach

Abstract The alpha decay half-lives of Z = 118–121 superheavy nuclei with A ≤ 300 are calculated by using the density-dependent nuclear potential in the framework of the WKB method. The Paris and Ried M3Y nucleon-nucleon potentials are used in the calculation of the double-folding potential, which the Paris potential predicts to be the larger value of the half-lives. The obtained half-lives with Paris parameterisation are compared with those using three semi-empirical formulas, namely the improved Sahu formula, the universal decay law for alpha decay, and the formula for both alpha decay and cluster decay. The predicted half-lives with double-folding lie in between the improved Sahu and universal decay law formulas for both alpha and cluster decay. However, it is closer to the universal decay law formula and obeys its trend in all the studied superheavy nuclei.

Prediction of Alpha Decay Half-Lives of Z = 118-121 Superheavy Nuclei with A ≤ 300 by Using the Double-Folding Potential

The effect of deformation and orientation of colliding nuclei on synthesis of superheavy elements

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