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Effects of Isospin on pre-scission particle multiplicity of Heavy Systems and ItsExcitation Energy Dependence

Communications in Theoretical Physics 2004年第5期41卷 751-756页

作者： YEWei CHENNa DepartmentofPhysics SoutheastUniversityNanjing210096China DepartmentofAppliedMathematics NanjingUniversityofFinance＆EconomicsNanjing210003China

Isospin effects on particle emission of fissioning isobaric sources and isotopic sources , and its dependence on the excitation energy are studied via Smoluchowski equations. It is shown that with increasing the isospin of fissioning systems, charged-particle emission is not sensitive to the strength of nuclear dissipation. In addition, we have found that increasing the excitation energy not only increases the influence of nuclear dissipation on particle emission but also greatly enhances the sensitivity of the emission of pre-scission neutrons or charged particles to the isospin of the system. Therefore, in order to extract dissipation strength more accurately by taking light particle multiplicities it is important to choose both a highly excited compound nucleus and a proper kind of particles for systems with different isospins.

关键词： isospin effect pre-scission particle multiplicity excitation energy fission diffusion model

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Study of pre-scission particle emissions and fission probability of the ^(178)W produced in fusion reactions

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Chinese Physics C 2014年第6期38卷 35-39页

作者： H.Eslamizadeh M.Pirpour Department of Physics Persian Gulf University 75169 Bushehr Iran

A dynamical model based on one-dimensional Langevin equations was used to calculate the average pre-fission multiplicities of neutrons, light charged particles, and the fission probability for compound nucleus 17Sw produced in fusion reactions. The pre-seission multiplicities of particles and fission probability are calculated and compared with the experimental data over a wide range of excitation energy. A modified wall and window dissipation with a reduction coefficient, ks, has been used in the Langevin equations for reproducing experimental data. It was shown that the results of the calculations are in good agreement with the experimental data by using values of ks in the range 0.24〈 ks 〈0.47.

关键词： fission pre-scission particle multiplicity fission probability

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Influence of Deformation on Light particles as a Probe of Nuclear Dissipation for a Neutron-Deficient ^178Pb System

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Communications in Theoretical Physics 2006年第4期45卷 687-690页

作者： YE Wei Department of Physics Southeast University Nanjing 210096 China

Using a diffusion model we investigate deformation effects on the sensitivity of different light particles to nuclear dissipation for a rather neutron-deficlent ^178Pb system. Galculations show that deformation significantly increases the sensitivity of neutron emission to dissipation strength, and that this effect becomes stronger with increasing deformation.

关键词： deformation effect isospin effect pre-scission particle multiplicity nuclear dissipation probe diffusion model

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