Dynamics of Nuclear Fission and Heavy-ion Reactions
Dynamics of Nuclear Fission and Heavy-ion Reactions

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Published: 1979

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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.

Dynamics of Fission and Heavy Ion Reactions
Dynamics of Fission and Heavy Ion Reactions

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Published: 1984

Total Pages:

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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.

Heavy-ion Dynamics And Hot Nuclei - Proceedings Of The 1995 Acs Nuclear Chem Award Symposium
Heavy-ion Dynamics And Hot Nuclei - Proceedings Of The 1995 Acs Nuclear Chem Award Symposium

Author: G Nebbia

Publisher: World Scientific

Published: 1995-09-28

Total Pages: 238

ISBN-13: 981454888X

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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.

Dynamics Of Heavy Ion Reactions Using The Energy Density Formalism
Dynamics Of Heavy Ion Reactions Using The Energy Density Formalism

Author: Raj Kumar

Publisher: LAP Lambert Academic Publishing

Published: 2012

Total Pages: 160

ISBN-13: 9783659253317

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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.

Heavy Ion Physics: Proceedings Of The Vi International School-seminar
Heavy Ion Physics: Proceedings Of The Vi International School-seminar

Author: Rumiana Kalpakchieva

Publisher: World Scientific

Published: 1998-08-22

Total Pages: 952

ISBN-13: 9814544698

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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.

Large-amplitude Dynamical Motion and Fluctuations in Nuclear Fission and Heavy-ion Reactions
Large-amplitude Dynamical Motion and Fluctuations in Nuclear Fission and Heavy-ion Reactions

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Published: 1981

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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).

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
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

Author: R. Russell Betts

Publisher: CRC Press

Published: 1991-03

Total Pages: 328

ISBN-13:

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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.

Proceedings of the 5th International Conference on Dynamical Aspects of Nuclear Fission
Proceedings of the 5th International Conference on Dynamical Aspects of Nuclear Fission

Author: Jan Kliman

Publisher: World Scientific

Published: 2002

Total Pages: 569

ISBN-13: 9812776729

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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.