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The State Density Correction Function in pre-equilibrium Exciton Model for 44Sc, 96M0, 148Sm and 172yB Nuclei

Journal of Physical Science and Application 2016年第1期6卷 115-122页

作者： Rasha S. Ahmed Department of Physics Al-Nahrain University Baghdad Iraq

The particle-hole state density in pre-equilibrium exciton model is required to calculate the cross section in pre-equilibrium nuclear reactions. In order to get a good match between theoretical and experimental data the state density need to be corrected with some corrections. In this work some of the corrections that must be added to the state density have been collected all in an energy dependent correction functionJ~. The effects of adding Pauli Exclusion Principle, bound state, finite depth of the nuclear potential and pairing corrections have been examined to energies up to 100 MeV. The results were obtained using energy dependent single particle level density or the non equi-distant spacing model. Comparisons are made by adding some and full combination of the corrections to get an accurate and convenient choice in pre-equilibrium state density estimations. The results are compared with available experimental （Oslo）, and theoretical （HF-BCS） results. Results have been found matching the previously obtained experimental and theoretical results.

关键词： pre-equilibrium exciton model state density correction function.

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Investigation of the Appropriate Partial Level Density Formula for pre-equilibrium Nuclear Exciton Model

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Journal of Applied Mathematics and Physics 2013年第3期1卷 47-54页

作者： Shafik Shakir Shafik Ali Dawoud Salloum Department of Physics College of Science for Women University of Baghdad Baghdad Iraq Department of Physics College of Science University of Baghdad Baghdad Iraq

Ericson formula represents the first formula, which was suggested to describe the partial level density (PLD) formula in pre-equilibrium region of the nuclear reactions. Then a number of corrections were added to this formula in order to make it more suitable to physical meaning. In this paper, there are two aims to be done: the first aim is to study the correspondence between one and two-components formulae in Ericson, Pauli, and pairing corrections;the second aim is to compare and study the results of Comprehensive formula, which contents with all corrections, with Ericson, Pauli, and pairing formulae. The Comprehensive formula was suggested to simulate the reality. To achieve these aims the 56Fe and 90Zr nuclei were chosen and the results showed that the difference between one and two-components formulae was too small which can be neglected. Furthermore, the results strongly recommended that for cross section calculations of the nuclear reaction, one must use Comprehensive formula rather than Pauli formula.

关键词： Partial Level Density pre-equilibrium Model Nuclear Reaction Exciton Model Equidistant Spacing Model 56Fe 90Zr

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Model Calculation of n + 6Li Reactions Below 20 MeV

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Communications in Theoretical Physics 2001年第10期36卷 437-442页

作者： ZHANG Jing-Shang HAN Yin-Lu China Nuclear Data Center China Institute of Atomic Energy Beijing 102413 China China Nuclear Data Center China Institute of Atomic Energy Beijing 102413 China

Based on the unified Hauser-Feshbach and exciton model for light nuclei, the calculations of reaction cross sections and the double-differential cross sections for n + 6Li are performed. Since all of the first-particle emissions are from the compound nucleus to the discrete levels, the angular momentum coupling effect in pre-equilibrium mechanism must be taken into account. The fitting of the measured data indicates that the three-body break-up process needs to be involved, and the pre-equilibrium reaction mechanism dominates the reaction processes. In light nucleus reactions the recoil effect must be taken into account.

关键词： pre-equilibrium emission, discrete levels, three-body break-up process

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