Dynamics of Nuclear Fission and Heavy-ion Reactions PDF Download
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Languages : en
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Book Description
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.
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Languages : en
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Book Description
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.
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Languages : en
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Book Description
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.
Author: D.A. Bromley
Publisher: Springer Science & Business Media
ISBN: 1461580978
Category : Science
Languages : en
Pages : 716
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Author: G Nebbia
Publisher: World Scientific
ISBN: 981454888X
Category :
Languages : en
Pages : 238
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Book Description
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.
Author: Wolf-Udo Schröder
Publisher: Routledge
ISBN:
Category : Science
Languages : en
Pages : 552
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Book Description
Author: Raj Kumar
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659253317
Category :
Languages : en
Pages : 160
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Book Description
Heavy ion reaction is a fast growing subject of nuclear physics. Heavy ions are the nuclei equal to or heavier than the alpha-particle. In this book, heavy ion reactions study within the dynamical cluster-decay model (DCM) and its simplified version -summed extended-Wong model of Gupta and collaborators, with deformation and orientations effects included and nuclear proximity potential derived from semi-classical extended Thomas Fermi model based on Skyrme energy density formalism, from different mass regions of Periodic Table are presented. The main aim of this work is to examine the fusion hindrance phenomenon via the modification of barrier in terms of, orientations of nuclei, the defining parameters of the Fermi density, or the Skyrme force parameters themselves. This book further advances the dynamics of heavy ion reaction. This work will be of interest to the nuclear physicists all over the globe.
Author: Rumiana Kalpakchieva
Publisher: World Scientific
ISBN: 9814544698
Category :
Languages : en
Pages : 952
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Book Description
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.
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Category :
Languages : en
Pages :
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Book Description
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).
Author: R. Russell Betts
Publisher: CRC Press
ISBN:
Category : Art
Languages : en
Pages : 328
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Book Description
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.
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Category :
Languages : en
Pages :
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