par Bonche, Paul;Flocard, Hubert;Heenen, Paul-Henri 
Référence Computer Physics Communications, 171, 1, page (49-62)
Publication Publié, 2005
Référence Computer Physics Communications, 171, 1, page (49-62)
Publication Publié, 2005
Article révisé par les pairs
| Résumé : | Over the years, the ev8 code has been a very useful tool for the study of nuclear mean-field theory. Its main characteristic is that it solves the Hartree-Fock plus BCS equations for Skyrme type functionals via a discretization of the individual wave-functions on a three-dimensional Cartesian mesh. This allows maximal flexibility in the determination of the nuclear shape by the variational process. For instance, the same mesh can be used to describe the oblate deformed, spherical, prolate deformed, superdeformed and fission configurations of a given nucleus. The quadrupole constraining operator yielding the deformation energy curve covering all these configurations is included in ev8. This version of the code is restricted to even-even nuclei. Title of program:ev8 Catalogue identifier:ADWA Program obtainable from: CPC Program Library, Queen's University of Belfast, N. Ireland Program summary URL: http://cpc.cs.qub.ac.uk/summaries/ADWA Licensing provisions: none Computers on which the program has been tested: HP-RX4640, Compaq-Digital Alpha GS140, has run on several other platforms Computer for which the program is designed and others on which is has been tested:Unix, Linux Operating systems or monitors under which the program has been tested:FORTRAN-90 Programming language used:depends on problem; example given requires 60 MB Memory required to execute with typical data:yes No. of lines in distributed program, including test data, etc.:11 524 No. of bytes in distributed program, including test data, etc.:89 949 Distribution format:tar.gzip file Nature of the physical problem:By means of the Hartree-Fock plus BCS method using Skyrme type functionals, ev8 allows a study of the evolution of the binding energy of even-even nuclei for various shapes determined by the most general quadrupole constraint. Solution method:The program expands the single-particle wave-functions on a 3D Cartesian mesh. The nonlinear mean-field equations are solved by the imaginary time step method. A quadratic constraint is used to obtain states corresponding to given values of the quadrupole tensor. Unusual features:The pairing correlations being included with the BCS method, a physically correct solution must not have any occupied single particle state in the continuum. This requires the Fermi energy of both nucleon species to be negative and their absolute value to be typically larger than twice the pairing gap. Running time:For the test case, which starts from Nilsson wave-functions, a deformed configuration of 84Zr is obtained with an accuracy better than 0.1 keV in 157 s on a HP-RX4640. Starting from this solution, other deformed configurations are obtained in less than 1 min. © 2005 Elsevier B.V. All rights reserved. |
