First Step Towards a Non-Adiabatic Description of the Fission Process Based on the Generator Coordinate Method

First Step Towards a Non-Adiabatic Description of the Fission Process Based on the Generator Coordinate Method
Author:
Publisher:
Total Pages: 6
Release: 2009
Genre:
ISBN:

Among the different theoretical approaches able to describe fission, microscopic ones can help us in the understanding of this process, as they have the advantage of describing the nuclear structure and the dynamics in a consistent manner. The sole input of the calculations is the nucleon-nucleon interaction. Such a microscopic time-dependent and quantum mechanical formalism has already been used, based on the Gaussian Overlap Approximation of the Generator Coordinate Method with the adiabatic approximation, to analyze the collective dynamics of low-energy fission in 238U. However, at higher energies, a few MeV above the barrier, the adiabatic approximation doesn't seem valid anymore. Indeed, manifestations of proton pair breaking have been observed in 238U and 239U for an excitation energy of 2.3 MeV above the barrier. Taking the intrinsic excitations into account during the fission process will enable us to determine the coupling between collective and intrinsic degrees of freedom, in particular from saddle to scission. Guidelines of the new formalism under development are presented and some preliminary results on overlaps between non excited and excited states are discussed.

Seminar On Fission

Seminar On Fission
Author: Cyriel Wagemans
Publisher: World Scientific
Total Pages: 332
Release: 2010-10-11
Genre: Science
ISBN: 9814464082

This conference is the seventh in a series of topical meetings dealing with the nuclear fission process, mainly at low excitation energy. During these meetings, actual topics are discussed by a group of experts. These proceedings give an overview of the topics treated, and permit a rapid overview of the current activities in the field.

Time-dependent Methods for Quantum Dynamics

Time-dependent Methods for Quantum Dynamics
Author: Kenneth C. Kulander
Publisher: North Holland
Total Pages: 612
Release: 1991
Genre: Science
ISBN:

This collection of articles clearly demonstrates that recent developments in time-dependent computational methods for quantum processes have resulted in significant contributions to the understanding of a remarkable broad spectrum of physical and chemical processes. These advances happened for two reasons. First, substantial improvements in the tools we use have occurred over the past decade and second there is a remarkable decrease in timescale over which observations of dynamical processes can be carried out. The papers presented here treat a wide variety of topics, including laser-induced dynamics by intense fields and short pulses, spectroscopy, tunneling, resonances, photodissociation, atomic collisions and gas-surface collisions, chemical reactions, molecular energy transfer, intramolecular relaxation, the influence of phase-space structure on quantum dynamics, nonadiabatic processes in condensed phases, systems in baths, nuclear collisions, fission, and fusion. The methods used in this issue include wave-packet propagation, Fourier transforms, time-dependent mean-field (SCF) methods, time-dependent correlation functions, path integrals, combined quantum/classical methods, hydrodynamic and fluid dynamical analogs, quantum statistical mechanics, perturbation theory, optical potentials and optimal control theory. This collection of time-dependent techniques is supplemented by a collection of 22 programs. Two of these are described in detail in the text. The programs are available in any desirable format and can be ordered by completing the coupon enclosed with the book.

The Nuclear Many-Body Problem

The Nuclear Many-Body Problem
Author: Peter Ring
Publisher: Springer Science & Business Media
Total Pages: 742
Release: 2004-03-25
Genre: Health & Fitness
ISBN: 9783540212065

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