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Author: Charles H. Sherman Publisher: ISBN: Category : Languages : en Pages : 32
Book Description
A model for cascades of atomic displacements was developed which is basically the same as earlier models but more general in its treatment of replacement collisions and energy lost to other lattice atoms when an atom is displaced. Simple analytical expressions were obtained for the average number of displacements produced per primary which are sufficiently accurate considering the uncertainties in the basic assumptions. Various specific cases of the model are illustrated numerically and discussed briefly relative to the possibility of using electron irradiation data to determine some of the parameters in the model. (Author).
Author: Charles H. Sherman Publisher: ISBN: Category : Languages : en Pages : 32
Book Description
A model for cascades of atomic displacements was developed which is basically the same as earlier models but more general in its treatment of replacement collisions and energy lost to other lattice atoms when an atom is displaced. Simple analytical expressions were obtained for the average number of displacements produced per primary which are sufficiently accurate considering the uncertainties in the basic assumptions. Various specific cases of the model are illustrated numerically and discussed briefly relative to the possibility of using electron irradiation data to determine some of the parameters in the model. (Author).
Author: D. Horváth Publisher: Springer Science & Business Media ISBN: 1489937013 Category : Science Languages : en Pages : 297
Book Description
This Workshop was organized to bring once more tagether the scientists of the rather heterogeneaus field of exotic atoms. At present the main topic of the field seems to be the study of the atomic cascade. There are some who study it intentionally -Iet us call them cascadeurs -and others who think they investigate other features of the exotic atoms (like Coulomb capture, particle transfer, muon catalyzed fusion, chemical effects, fundamental properties, etc.) -users-while in fact they study some special consequences of the same atomic cascade. We decided to get cascadeurs and users discuss the problems of exotic atoms at wonderful Erice, at the 5th Course of the International School of Physics of Exotic Atoms. Our Workshop was quite successful, we have heard excellent talks from participants from a dozen countfies and most of them have prepared written contributions for this volume. The Organizers express their gratitude to all participants for their contributions, especially to David Measday for bis concluding remarks (not printed here) and to James Cohen for jumping in for Leonid Ponomarev who had to leave unexpectedly in the middle of the meeting. We greatly appreciate the enthusiastic help of Marianne Signer in every stage of the organization work. Am!, of course, the Workshop could not happen at all without the incredibly efficient organization by the Ettore Majorana Centre of Scientific Culture. Leopold M. Simons Dezsö Horvath Gabriele Torelli V CONTENTS OPENING ADDRESS . . . . . . . . . . . . . . . . . . . . . . . . . . xi . . . . . . .
Author: Publisher: ISBN: Category : Languages : en Pages : 6
Book Description
We used molecular dynamics modeling of atomic displacement cascades to characterize the nature of primary radiation damage in 3C-SiC. We demonstrated that the most commonly used interatomic potentials are inconsistent with ab initio calculations of defect energetics. Both the Tersoff potential used in this work and a modified embedded-atom method potential reveal a barrier to recombination of the carbon interstitial and carbon vacancy which is much higher than the density functional theory (DFT) results. The barrier obtained with a newer potential by Gao and Weber is closer to the DFT result. This difference results in significant differences in the cascade production of point defects. We have completed both 10 keV and 50 keV cascade simulations in 3C-SiC at a range of temperatures. In contrast to the Tersoff potential, the Gao-Weber potential produces almost twice as many C vacancies and interstitials at the time of maximum disorder (~0.2 ps) but only about 25% more stable defects at the end of the simulation. Only about 20% of the carbon defects produced with the Tersoff potential recombine during the in-cascade annealing phase, while about 60% recombine with the Gao-Weber potential.
Author: C.J. McHargue Publisher: Springer Science & Business Media ISBN: 9400909837 Category : Technology & Engineering Languages : en Pages : 517
Book Description
The use of ion beams for the modification of the structure and properties of the near-surface region of ceramics began in earnest in the early 19805. Since the mechanical properties of such materials are dominated by surface flaws and the surface stress state, the use of surface modification tech niques would appear to be an obvious application. As is often the case in research and development, most of the initial studies can be characterized as cataloging the response of various ceramic materials to a range of ion beam treatments. The systematic study of material and ion beam parameters is well underway and we are now designing experiments to provide specific information about the processing parameter - structure-property rela tionships. This NATO-Advanced Study Institute was convened in order to assess our current state of knowledge in this field, to identify opportunities and needs for further research, and to identify the potential of such processes for technological application. It became apparent that this class of inorganic compounds, loosely termed ceramics, presents many challenges to the understanding of ion-solid inter actions, the relationships among ion-beam parameters, materials parameters, and the resulting structures, as well as relationships between structure and properties. In many instances, this understanding will represent a major extension of that learned from the study of metals and semiconductors.
Author: Il-t Cheon Publisher: World Scientific ISBN: 9814492752 Category : Science Languages : en Pages : 462
Book Description
The unique role of strangeness in nuclear physics has recently attracted much attention, from both the theoretical and experimental viewpoints. This is due not only to the broad spectrum of possible hadron many-body systems with strangeness, but also to the fact that strangeness gives us an opportunity to study fundamental baryon-baryon interactions in a new perspective. Our knowledge of this subject has widened as the scope of hypernuclear experiments has expanded from strangeness exchange and the associated production reactions to hypernuclear weak decays, β decays, cascade hypernuclei, double-Λ events, electroproduction of strangeness, etc. This trend will be accelerated by the full operation of new laboratories such as TJLab, COSY, DAΦNE, JHF, MAMI, and others. Various aspects of those important and exciting topics are discussed in this book in order to get a perspective of this fast developing area of nuclear physics.
Author: Hisashi Horiuchi Publisher: World Scientific ISBN: 9814544728 Category : Languages : en Pages : 554
Book Description
The recent rapid innovations in supercomputer technology are changing the concepts of numerical calculations employed in solving a wide variety of nuclear many-body problems. The purpose of the XVII RCNP International Symposium on Innovative Computational Methods in Nuclear Many-Body Problems (INNOCOM97) was to discuss the frontiers of various computational methods and to exchange ideas in wide fields of nuclear physics. The subjects discussed at the symposium covered almost all the areas of nuclear physics.
Author: Charles H. Sherman
Author: Charles H. Sherman
Author: D. Horváth
Author: 
Author: Thomas Skjelborg Jensen
Author: C.J. McHargue
Author: Il-t Cheon
Author: Richard Arnold Holt
Author: Hisashi Horiuchi
Author: 
Author: