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Manuscript Title: A computer program for relativistic multiple Coulomb and nuclear excitation.
Authors: C.A. Bertulani
Program title: RELEX
Catalogue identifier: ADJO_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 116(1999)345
Programming language: Fortran.
Computer: IBM-PC.
Operating system: MS-DOS, UNIX.
RAM: 8M words
Word size: 64
Keywords: Nuclear physics, Coulomb excitation, Relativistic collisions, Coupled-channels, Nuclear excitation.
Classification: 17.13.

Nature of problem:
The program calculates relativistic Coulomb and nuclear excitation cross sections of electric dipole, electric quadrupole and magnetic dipole transitions. It is particularly useful in the analysis of experiments with radioactive beams performed at several cyclotron laboratories around the world, and also of experiments on excitation of giant resonances in peripheral relativistic nucleus-nucleus collisions.

Solution method:
The time dependent Coulomb +nuclear field of a relativistic projectile is expanded into multipoles. The nuclear wavefunction is a linear combination of eigenstates of the intrinsic nuclear Hamiltonian. A set of coupled equations for the time-dependent excitation amplitudes is obtained. A four-point Runge-Kutta procedure is used to solve the coupled-channels equations.

Running time:
Almost all the CPU time is consumed by the solution of the coupled-channels equations. It is about 2 min for the inclusion of 5 nuclear states.