Download or read book Dynamics of Fission and Heavy Ion Reactions written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advances in a unified macroscopic-microscopic description of large-amplitude collective nuclear motion such as occurs in fission and heavy ion reactions are discussed. With the goal of finding observable quantities that depend upon the magnitude and mechanism of nuclear dissipation, one-body dissipation and two-body viscosity within the framework of a generalized Fokker-Planck equation for the time dependence of the distribution function in phase space of collective coordinates and momenta are considered. Proceeding in two separate directions, the generalized Hamilton equations of motion for the first moments of the distribution function with a new shape parametrization and other technical innovations are first solved. This yields the mean translational fission-fragment kinetic energy and mass of a third fragment that sometimes forms between the two end fragments, as well as the energy required for fusion in symmetric heavy-ion reactions and the mass transfer and capture cross section in asymmetric heavy-ion reactions. In a second direction, we specialize to an inverted-oscillator fission barrier and use Kramers' stationary solution to calculate the mean time from the saddle point to scission for a heavy-ion-induced fission reaction for which experimental information is becoming available. 25 references.
Download or read book Dynamics of Nuclear Fission and Heavy ion Reactions written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Large-amplitude collective motion in fission and heavy-ion reactions is studied by solving classical equations of motion for the time evolution of the nuclear shape. In the nuclear potential energy of deformation, the generalized surface energy was calculated by means of a double volume integral of a Yukawa-plus-exponential function, which was obtained by requiring that two semi-infinite slabs of constant-density nuclear matter have minimum energy at zero separation. The collective kinetic energy is calculated for nuclear flow that is a superposition of incompressible, nearly irrotational collective-shape motion and rigid-body rotation. Nuclear dissipation is included by means of the Rayleigh dissipation function, which depends upon the physical mechanism that converts collective energy into internal energy. For both ordinary two-body viscosity and a combined wall and window one-body dissipation, fission-fragment kinetic energies are calculated for the fission of nuclei throughout the periodic table and compare with experimental results. Finally, the one-body dynamics of nucleons inside a cylinder colliding with a moving piston is explicitly studied by solving exactly the collisionless Boltzmann equation for the distribution function. By examining the relative phases of the pressure at the piston and the piston's velocity, a dissipative force and an elastic restoring force can be separately identified. 9 references.
Download or read book Large amplitude Dynamical Motion and Fluctuations in Nuclear Fission and Heavy ion Reactions written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In studies of the dynamics of large-amplitude nuclear motion, a useful starting point is the separation of the total degrees of freedom into two types: a few collective degrees of freedom describing the shape of the nuclear surface that are treated explicitly and the remaining relatively large number of internal degrees of freedom that are treated implicitly. Once such a separation has been made, it is necessary to describe the transfer of energy between the collective and internal degrees of freedom, as well as the Brownian fluctuations in the collective degrees of freedom arisng from an implicit treatment of the internal degrees of freedom. The goal of the present work is, unlike previous efforts, to describe simultaneously both the average dynamical motion and the Brownian fluctuations in terms of quantities that are calculated from specified nuclear models. The general approach is described, but no results have been obtained as yet. (RWR).
Download or read book Theoretical Approaches of Heavy Ion Reaction Mechanisms written by M. Martinot and published by Elsevier. This book was released on 2016-06-03 with total page 443 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theoretical Approaches of Heavy Ion Reaction Mechanisms provides information pertinent to heavy ion reactions and nuclear fission at low energies. This book discusses the features of the time-dependent solution of the Kramer–Chandrasekhar equation. Organized into 27 chapters, this book begins with an overview of the deexcitation process of a highly excited nucleus by means of its decay into two fragments. This text then presents a microscopic description to extract the characteristics features of the collective dynamics of the fission process at low energy. Other chapters consider nuclear fission as a transport process over the fission barrier. This book discusses as well the microscopic foundations of the phenomenological collective models. The final chapter deals with the composition of the baryons and mesons in terms of gluons and quarks. This book is a valuable resource for nuclear and high energy physicists. Experimentalists, theoreticians, and research workers will also find this book useful.
Download or read book Treatise on Heavy Ion Science written by D.A. Bromley and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Fission and Heavy ion induced Reactions written by Wolf-Udo Schröder and published by Routledge. This book was released on 1987 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Heavy ion Dynamics And Hot Nuclei Proceedings Of The 1995 Acs Nuclear Chem Award Symposium written by G Nebbia and published by World Scientific. This book was released on 1995-09-28 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book of proceedings contains contributions of about 30 prominent scientists who were or are associated with the awardee, Prof J B Natowitz, and are working in the field of heavy-ion reactions.The papers contained in this book represent an up-to-date overview of the most interesting topics related to the formation and decay of hot nuclei and to nuclear dynamics.
Download or read book Dynamical Calculations of Nuclear Fission and Heavy ion Reactions written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: With the goal of determining the magnitude and mechanism of nuclear dissipation from comparisons of predictions with experimental data, we describe recent calculations in a unified macroscopic-microscopic approach to large-amplitude collective nuclear motion such as occurs in fission and heavy-ion reactions. We describe the time dependence of the distribution function in phase space of collective coordinates and momenta by a generalized Fokker-Planck equation. The nuclear potential energy of deformation is calculated as the sum of repulsive Coulomb and centrifugal energies and an attractive Yukawa-plus-exponential potential, the inertia tensor is calculated for a superposition of rigid-body rotation and incompressible, nearly irrotational flow by use of the Werner-Wheeler method, and the dissipation ensor that describes the conversion of collective energy into single-particle excitation energy is calculated for two prototype mechanisms that represent opposite extremes of large and small dissipation. We solve the generalized Hamilton equations of motion for the first moments of the distribution function to obtain the mean translational fission-fragment kinetic energy and mass of a third fragment that sometimes forms between the two end fragments, as well as dynamical thresholds, capture cross sections, and ternary events in heavy-ion reactions. 33 references.
Download or read book Dynamics of Heavy Ion Induced Reactions written by BirBikram Singh and published by LAP Lambert Academic Publishing. This book was released on 2012 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work presented in this book deals with the study of heavy ion reaction dynamics using the Dynamical Cluster-decay Model (DCM). DCM is used to study the decay of excited (hot and rotating) compound systems formed in low energy heavy ion reactions, including the deformations and orientations degrees of freedom for reactants/products. To study the ground state decays, the exotic cluster radioactivity, we have used the Pre-formed Cluster-decay Model (PCM), which also includes the deformation and orientation effects of daughter and cluster nuclei. We have studied the possible decay modes of various nuclear systems. The reaction dynamics of hot and rotating light as well as heavier compound systems at low energies have been studied extensively. It is relevant to mention here that the experimental studies have started analyzing the role of orientation degrees of freedom for deformed nuclei in the measured fusion-fission cross-sections, though the use/identification of the actually polarized nuclei is still to be realized. Such studies will help explore the yet unknown landscapes in order to approach towards the island of stability' and to extend the periodic table further.
Download or read book Heavy Ion Physics Proceedings Of The Vi International School seminar written by Rumiana Kalpakchieva and published by World Scientific. This book was released on 1998-08-22 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents recent results on experimental and theoretical studies of the interaction of heavy ions with nuclei at low and intermediate energies: the dynamics of fusion and decay of complex nuclear systems, the synthesis of superheavy elements, the synthesis and properties of exotic nuclei close to the proton and neutron driplines, nuclear fission, nuclear structure, and reactions with stable and radioactive ion beams. It also covers some aspects of applied physics research: track membranes and their applications, the use of polymers in medicine and electronics, production and application of radioisotopes for medical purposes, and environmental protection.
Download or read book Dynamical Aspects Of Nuclear Fission Proceedings Of The 5th International Conference Danf01 written by Stefan Gmuca and published by World Scientific. This book was released on 2002-12-13 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of the DANF conference was to present and discuss new theoretical and experimental results in the field of nuclear fission dynamics. The conference program was designed to cover a wide range of physical phenomena including spontaneous and induced fission at low and intermediate energies and fragmentation of hot nuclei. Among the topics discussed at the conference were: the development of various theories, experiments on the synthesis of superheavy elements, fusion-fission processes and the decay of complex nuclear systems, binary and ternary fission, nuclear structure of neutron-rich nuclei and the peculiarities of exotic nuclear reactions. Attention was also paid to the recent progress in developing radioactive ion beam facilities. The development of new methods was also on the conference agenda.
Download or read book Heavy Ion Reactions at Low Energies written by Valery Zagrebaev and published by Springer Nature. This book was released on 2019-11-20 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is based on Valery Zagrebaev's original papers and lecture materials on nuclear physics with heavy ions, which he prepared and extended through many years for the students of nuclear physics specialties. Thе book outlines the main experimental facts on nuclear reactions involving heavy ions at low energies. It focuses on discussions of nuclear physics processes that are a subject of active, modern research and it gives illustrative explanations of these phenomena in the framework of up-to-date theoretical concepts. This textbook is intended for students in physics who have completed a standard course of quantum mechanics and have basic ideas of nuclear physics processes. It is designed as a kind of lifeboat that, at the end of the course, will allow students to navigate the modern scientific literature and to understand the goals and objectives of current, on-going research.
Download or read book Macroscopic Description of Heavy ion Reactions written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We discuss the statics and dynamics of large scale nuclear collective motion, with special emphasis on very-heavy-ion reactions. Compound-nucleus cross sections are calculated by use of the criterion that the dynamical trajectory for the fusing system must pass inside the fission saddle point in a multidimensional space in order to form a compound nucleus. In an effort to understand whether nuclear dissipation is dominated by two-body collisions or by the interaction of particles with the mean field generated by the remaining particles, we compare the predictions of various macroscopic approaches with those of time-dependent mean-field (Hartree-Fock) theories.
Download or read book Nuclear Structure and Heavy ion Reaction Dynamics 1990 Proceedings of the Workshop on the Interface Between Nuclear Structure and Heavy ion Reaction Dynamics Held at the University of Notre Dame Indiana USA 24 26 May 1990 written by R. Russell Betts and published by CRC Press. This book was released on 1991-03 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings focus on heavy ion interactions in which the interplay of nuclear structure effects and reaction dynamics is important. It covers areas such as heavy ion fusion, Coulomb excitation and transfer reactions, damped heavy-ion collisions, nuclear structure effects in compound nucleus formation and decay and nuclear structure effects in breakup and fragmentation reactions.
Download or read book Proceedings of the 5th International Conference on Dynamical Aspects of Nuclear Fission written by Jan Kliman and published by World Scientific. This book was released on 2002 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of the DANF conference was to present and discuss new theoretical and experimental results in the field of nuclear fission dynamics. The conference program was designed to cover a wide range of physical phenomena including spontaneous and induced fission at low and intermediate energies and fragmentation of hot nuclei. Among the topics discussed at the conference were: the development of various theories, experiments on the synthesis of superheavy elements, fusion-fission processes and the decay of complex nuclear systems, binary and ternary fission, nuclear structure of neutron-rich nuclei and the peculiarities of exotic nuclear reactions. Attention was also paid to the recent progress in developing radioactive ion beam facilities. The development of new methods was also on the conference agenda.
Download or read book Dynamical Aspects Of Nuclear Fission 4th International Conf Danf 98 Oct 98 Slovak written by Stefan Gmuca and published by World Scientific. This book was released on 1999-12-28 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the latest results of experimental and theoretical studies of fission and fusion-fission dynamics from low to intermediate energies. It covers new results on the synthesis of superheavy elements and the decay of complex nuclear systems, binary and ternary fission, fragmentation, the decay of hot nuclei, and the nuclear structure of neutron-rich nuclei. It also discusses some questions concerning the incineration and transmutation of actinides from nuclear waste. Graduate students and researchers can use this book to review recent progress and explore future directions in the development of radioactive ion beam facilities.
Download or read book Multifragmentation in Heavy Ion Reactions written by Rajeev K. Puri and published by CRC Press. This book was released on 2023-10-26 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a collection of reviews of some of the recent developments in nuclear physics research at intermediate energies from across the globe. It especially focuses on the most essential aspects, such as multifragmentation and associated phenomena in nuclear collisions, with the incident energy region between a few MeV and several hundreds of MeV/nucleon. The topic of the book—multifragmentation—was chosen based on the fact that all heavy-ion collisions revolve around a fragmenting system, which is also thought to have a link to phase transitions. One unique and valuable dimension of this book is that it has brought together the research of several experts working in the field of intermediate energy heavy-ion collisions in various renowned laboratories of the world. It provides a thorough review of the recent developments in various related phenomena, especially multifragmentation, observed at the intermediate-energy range, both theoretically and experimentally. It extensively discusses the concept of nuclear symmetry energy, which is important for the nuclear physics and astrophysics communities. In addition, the book identifies potential research directions and technologies that will drive future innovations. It will serve as a valuable reference for a larger audience, including students who wish to pursue a career in nuclear physics and astrophysics.
