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Author: Ahmed A. Selman Publisher: LAP Lambert Academic Publishing ISBN: 9783659135941 Category : Languages : en Pages : 180
Book Description
This book reviews statistical exciton model of nuclear reactions, and how it is used to calculate Preequilibrium Emission (PE) spectra and reaction cross-sections at energies about 80 MeV. Numerical calculations are made for a two-component system, for (N, N) reactions with Fe-54, Fe-56, Rh-103, and Bi-209 nuclei. Two contributions to the existing model are made: The development of a complete and analytical solution to calculate the state density of excited states based on the one-component non-Equidistant Spacing Model (non-ESM). Also, a simple numerical approach to solve the master equation at energies less than 80 MeV is presented. A variety of quantities required during PE calculation, such as the state density of the excited states, the effective matrix element of the specified reaction, the occupation probability of exciton states, and others are discussed and numerically calculated using a library of MATLAB codes written for this purpose. PE spectra for selected reactions are numerically calculated and compared with earlier calculations.
Author: Ahmed A. Selman Publisher: LAP Lambert Academic Publishing ISBN: 9783659135941 Category : Languages : en Pages : 180
Book Description
This book reviews statistical exciton model of nuclear reactions, and how it is used to calculate Preequilibrium Emission (PE) spectra and reaction cross-sections at energies about 80 MeV. Numerical calculations are made for a two-component system, for (N, N) reactions with Fe-54, Fe-56, Rh-103, and Bi-209 nuclei. Two contributions to the existing model are made: The development of a complete and analytical solution to calculate the state density of excited states based on the one-component non-Equidistant Spacing Model (non-ESM). Also, a simple numerical approach to solve the master equation at energies less than 80 MeV is presented. A variety of quantities required during PE calculation, such as the state density of the excited states, the effective matrix element of the specified reaction, the occupation probability of exciton states, and others are discussed and numerically calculated using a library of MATLAB codes written for this purpose. PE spectra for selected reactions are numerically calculated and compared with earlier calculations.
Author: Ettore Gadioli Publisher: ISBN: Category : Science Languages : en Pages : 546
Book Description
While we have attempted to mention at least the most important developments in the theory of pre-equilibrium reactions, the volume of work in this area over the last few years has been so immense that it is not possible to give a comprehensive account of all that has been done. Our aim is to describe as clearly as we can the main physical ideas and to sketch the mathematical formulations that have been developed to enable practical calculations to be made. We attach particular importance to the detailed comparisons between theory and experiment because only in this way is it possible to assess the usefulness and validity of the theories that have been proposed.
Author: Dieter Seeliger Publisher: World Scientific ISBN: 9814556076 Category : Languages : en Pages : 312
Book Description
The symposium covered the following topics: Physical foundation of preequilibrium reaction models; Randomness in nuclei and nuclear reactions; Statistical multistep compound and direct reactions; Exit channels in nuclear reactions: n, p, α, and γ-emission as well as fission; Multiple emission processes; Parameter systematics for nuclear model calculations; New approaches to angular distributions; Experiments for reaction mechanism studies; Applications for nuclear data evaluation.
Author: Publisher: ISBN: Category : Languages : en Pages : 6
Book Description
Recent developments of the Cascade-Exciton Model (CEM) of nuclear reactions are described. The improved cascade-exciton model as implemented in the code CEM97 differs from the CEM95 version by incorporating new approximations for the elementary cross sections used in the cascade, using more precise values for nuclear masses and pairing energies, using corrected systematics for the level-density parameters, and several other refinements. We have improved algorithms used in many subroutines, decreasing the computing time by up to a factor of 6 for heavy targets. We describe a number of further improvements and changes to CEM97, motivated by new data on isotope production measured at GSI. This leads us to CEM2k, a new version of the CEM code. CEM2k has a longer cascade stage, less preequilibrium emission, and evaporation from more highly excited compound nuclei compared to earlier versions. CEM2k also has other improvements and allows us to better model neutron, radionuclide, and gas production in ATW spallation targets. The increased accuracy and predictive power of the code CEM2k are shown by several examples. Further necessary work is outlined. KEYWORDS: Intranuclear cascade, preequilibrium, evaporation, and fission reactions, Monte Carlo simulations, cascade-exciton model, particle spectra, spallation and fission cross sections, GSI data.
Author: R H Lemmer Publisher: World Scientific ISBN: 9814553972 Category : Languages : en Pages : 238
Book Description
The basic theory of multistep nuclear reactions as developed by Feshbach, Kerman and Koonin in the seventies, and published in final form in 1980, has served as strong stimulus for both theorists and experimentalists working in this exciting field. The meeting held at Faure brought together some of the leading experts in this field to discuss current progress and problems in the multistep process in nuclear reaction physics from both the theoretical and experimental standpoint.
Author: Pavol Oblozinsky Publisher: World Scientific ISBN: 9814543675 Category : Languages : en Pages : 550
Book Description
This volume provides the up-to-date information behind nuclear reactor calculations, focusing on a key role of nuclear reaction data, down to the physics of nuclear interactions. It is divided into three parts. Part 1 deals with nuclear reaction models, including neutron resonances, fission, the optical model, statistical and preequilibrium models as well as nuclear level densities. Part 2 is devoted to nuclear data filling and processing; it includes lectures on nuclear data evaluation and formatting, data libraries and services, with emphasis on nuclear-data-processing codes. Part 3 presents applications in nuclear reactor calculations, emphasizing physics, design and safety.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Calculations of particle energy spectra resulting from the photonuclear reactions at energies below the meson production threshold have been carried out in the framework of combining the pre-equilibrium exiton model and the quasi-deuteron model. A 2p-2h initial state in the exciton model is assumed because in the energy region above giant resonance the quasi-deuteron absorption is the dominant process. With these combined models, the subsequent secondary interactions of the emerging particle with the rest of the nucleus following the initial photon-nucleus interaction are appropriately taken into account. The experimental difference energy spectra of fast photoneutrons from several elements (Al, Cu, In, Sn, Ta, Pb, Bi and U) at bremsstrahlung energies of 55 and 85 MeV and the photoproton energy spectra from 12C at bremsstrahlung energy 110 MeV were compared with the theoretical predictions. General agreements in both spectral shapes and cross sections are obtained. The relative yields of the reactions (.gamma., xn) resulting from monoenergetic photons on 127I at 50, 100 and 150 MeV are also predicted reasonably well by the combined models together with the conventional evaporation theory.
Author: Ahmed A. Selman
Author: Ahmed A. Selman
Author: Ettore Gadioli
Author: Dieter Seeliger
Author: 
Author: Brigitte Strohmaier
Author: Academy of General Practice of Pharmacy (U.S.)![Nuclear Reaction Mechanisms Studied in [alpha]- and 1C-induced Reactions PDF](https://books.google.com/books/content/images/frontcover/p4whAQAAMAAJ?fife=w80-h100)
Author: Mats Rydehell
Author: R H Lemmer
Author: Pavol Oblozinsky![Pre-equilibrium Particle Decay in the Photonuclear Reactions. [Exciton and Quasi-deuteron Models]. PDF](https://books.google.com/books/content/images/frontcover/K-u8wgEACAAJ?fife=w80-h100)
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