Download or read book A Microscopic Theory of Fission Dynamics Based on the Generator Coordinate Method written by Walid Younes and published by Springer. This book was released on 2019-01-09 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces a quantum-mechanical description of the nuclear fission process from an initial compound state to scission. Issues like the relevant degrees of freedom throughout the process, the way of coupling collective and intrinsic degrees during the fission process, and how a nucleus divides into two separate daughters in a quantum-mechanical description where its wave function can be non-local, are currently being investigated through a variety of theoretical, computational, and experimental techniques. The term “microscopic” in this context refers to an approach that starts from protons, neutrons, and an effective (i.e., in-medium) interaction between them. The form of this interaction is inspired by more fundamental theories of nuclear matter, but still contains parameters that have to be adjusted to data. Thus, this microscopic approach is far from complete, but sufficient progress has been made to warrant taking stock of what has been accomplished so far. The aim is to provide, in a pedagogical and comprehensive manner, one specific approach to the fission problem, originally developed at the CEA Bruyères-le-Châtel Laboratory in France. Intended as a reference for advanced graduate students and researchers in fission theory as well as for practitioners in the field, it includes illustrative examples throughout the text to make it easier for the reader to understand, implement, and verify the formalism presented.
Download or read book Microscopic Theory of Fission written by and published by . This book was released on 2008 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Microscopic Theory of Fission written by and published by . This book was released on 2017 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Microscopic Theory of Fission written by and published by . This book was released on 2009 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fission-fragment properties have been calculated for thermal neutron-induced fission on a 239Pu target, using constrained Hartree-Fock-Bogoliubov calculations with a finite-range effective interaction. A quantitative criterion based on the interaction energy between the nascent fragments is introduced to define the scission configurations. The validity of this criterion is benchmarked against experimental measurements of the kinetic energies and of multiplicities of neutrons emitted by the fragments.
Download or read book Fragment Yields Calculated in a Time Dependent Microscopic Theory of Fission written by and published by . This book was released on 2012 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microscopic Description of Nuclear Fission at Finite Temperature written by Jordan David McDonnell and published by . This book was released on 2012 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: While a predictive, microscopic theory of nuclear fission has been elusive, advances in computational techniques and in our understanding of nuclear structure are allowing us to make significant progress. Through nuclear energy density functional theory, we study the fission of thorium and uranium isotopes in detail. These nuclides have been thought to possess hyperdeformed isomers in the third minima of their potential energy surfaces, but microscopic theories tend to estimate either shallow or non-existent third minima in these nuclei. We seek an explanation in terms of neutron shell effects. We study how the fission pathways, the symmetry, and the third minima of these nuclei evolve with increasing excitation energy. We then study the fission of mercury-180, in which a recent experiment unexpectedly discovered that this nucleus fissions asymmetrically. We find that the fission of mercury-180 and mercury-198 is driven by subtleties in shell effects on the approach to scission. We finally survey fission barrier heights and spontaneous fission half-lives of several actinide nuclei, from radium to californium. For a new energy density functional, we find good agreement between our calculations and available experimental data, lending confidence to the predictions of our theory beyond experimentally measured nuclei.
Download or read book Fission Dynamics in a Microscopic Theory written by Shi Jin and published by . This book was released on 2019 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is concerned with the application of the time-dependent density functional theory (TDDFT) to investigate the fission dynamics of atomic nucleus, which is still one of the most complicated problem in nuclear physics and a full microscopic interpretation is still missing. The establishment of the time-dependent superfluid local density approximation (TDSLDA) and the increasing power of computing resources make the three-dimensional symmetry unrestricted simulations of fission dynamics possible in recent years. In this work, a qualitative new nuclear energy density functional (NEDF) is developed, which contains only seven uncorrelated fitting parameters, and have excellent performance in describing various nuclear properties, e.g. nuclear mass, charge radii, neutron separation energy, shell structure, and deformation properties like the height of fission barriers and the excitation energy of fission isomer. Using such NEDF and another popular NEDF among fission practitioners, SkM*, a comprehensive study of fission dynamics with TDSLDA formalism is presented. The role of pairing correlations in fission dynamics is demonstrated quantitatively. It is also shown that independent TDSLDA trajectories with different initial conditions on the potential energy surface generate almost the same fission fragment (FF) configurations, e.g. the mass split, total kinetic energy, total excitation energies etc. An important aspect of this study is to provide a quantitative validation that the fission dynamics from saddle to scission is a non-adiabatic, overdamped one. To overcome the limitation of TDDFT that fails to produce the variances in the FF properties, a novel method in the spirit of the classical Langevin approach is promoted to include fluctuations and dissipations into the TDDFT framework. Promising results are obtained in a simpler nuclear hydrodynamics simulation, while its implementation in full TDSLDA calculation is still challenging.
Download or read book A Microscopic Theory of Low Energy Fission written by and published by . This book was released on 2013 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Theory written by Judah M. Eisenberg and published by . This book was released on 1987 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theory of Nuclear Fission written by Hans J. Krappe and published by Springer Science & Business Media. This book was released on 2012-02-06 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together various aspects of the nuclear fission phenomenon discovered by Hahn, Strassmann and Meitner almost 70 years ago. Beginning with an historical introduction the authors present various models to describe the fission process of hot nuclei as well as the spontaneous fission of cold nuclei and their isomers. The role of transport coefficients, like inertia and friction in fission dynamics is discussed. The effect of the nuclear shell structure on the fission probability and the mass and kinetic energy distributions of the fission fragments is presented. The fusion-fission process leading to the synthesis of new isotopes including super-heavy elements is described. The book will thus be useful for theoretical and experimental physicists, as well as for graduate and PhD students.
Download or read book An Introduction to Nuclear Fission written by Walid Younes and published by Springer Nature. This book was released on 2021-11-15 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: This hands-on textbook introduces physics and nuclear engineering students to the experimental and theoretical aspects of fission physics for research and applications through worked examples and problem sets. The study of nuclear fission is currently undergoing a renaissance. Recent advances in the field create the opportunity to develop more reliable models of fission predictability and to supply measurements and data to critical applications including nuclear energy, national security and counter-proliferation, and medical isotope production. An Introduction to Nuclear Fission provides foundational knowledge for the next generation of researchers to contribute to nuclear fission physics.
Download or read book Nuclear Fission written by Patrick Talou and published by Springer Nature. This book was released on 2023-01-01 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides advanced students and postdocs, as well as current practitioners of any field of nuclear physics involving fission an understanding of the nuclear fission process. Key topics covered are: fission cross sections, fission fragment yields, neutron and gamma emission from fission and key nuclear technologies and applications where fission plays an important role. It addresses both fundamental aspects of the fission process and fission-based technologies including combining quantitative and microscopic modeling.
Download or read book Particle Emission From Nuclei written by Dorin N. Poenaru and published by CRC Press. This book was released on 2018-05-04 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has three volume. The first volume is mainly devoted to the macroscopic-microscopic theory in its traditional form and extended to very high mass and charge asymmetry. Applications of this theory to the emission of different kinds of charged particles from nuclei are presented in the second volume, where recent experimental achievements in alpha decay, proton, and heavy ion (14C, 24Ne, 28Mg, etc.) radioactivities are also discussed. Experiments on spontaneous fission, fission isomers, and more complex phenomena like particle-accompanied fission,delayed processes: p, a, 2p, t, n, 2n, 3n, and the new mechanism of cold fission (or fission with compact shapes) are described in detail in the third volume.
Download or read book Particle Emission from Nuclei written by Dorin N. Poenaru and published by CRC Press. This book was released on 2017-11-29 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has three volume. The first volume is mainly devoted to the macroscopic-microscopic theory in its traditional form and extended to very high mass and charge asymmetry. Applications of this theory to the emission of different kinds of charged particles from nuclei are presented in the second volume, where recent experimental achievements in alpha decay, proton, and heavy ion (14C, 24Ne, 28Mg, etc.) radioactivities are also discussed. Experiments on spontaneous fission, fission isomers, and more complex phenomena like particle-accompanied fission, �delayed processes: p, a, 2p, t, n, 2n, 3n, and the new mechanism of cold fission (or fission with compact shapes) are described in detail in the third volume.
Download or read book Microscopic Theory of the Nucleus written by Judah M. Eisenberg and published by . This book was released on 1972 with total page 519 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microscopic Theory of the Nucleus written by Judah Moshe Eisenberg and published by . This book was released on 1976 with total page 519 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theory of Particle and Cluster Emission written by Doru S Delion and published by Springer. This book was released on 2011-03-30 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
