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Manuscript Title: Nuclear state density calculations: an exact recursive approach.
Authors: E. Mainegra, R. Capote
Program title: TotStade
Catalogue identifier: ADQS_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 150(2003)43
Programming language: Fortran.
Computer: PCs (Pentium class).
Operating system: COMPAQ-DIGITAL UNIX, Microsoft WINDOWS.
RAM: 225K words
Word size: 32
Keywords: Independent-particle model, Total state density, Particle-hole state density, Nuclear reactions, Nuclear physics, Spectroscopy, Level scheme.
Classification: 17.15.

Nature of problem:
This FORTRAN code is designed to calculate exact total and particle-hole state densities for a given single particle level scheme. The state density is obtained under the independent particle assumption. Therefore no residual interaction can be considered in this approach. The obtained total and/or particle-hole level densities can be used in preequlibrium and equilibrium nuclear reaction models calculations or as input for refined nuclear level density calculations, where residual interactions can be accounted for. Both odd and even systems can be treated.

Solution method:
A method which is mathematically exact is used; its key element being a recursion relation for the calculation of the coefficients of a finite order partition function as proposed by Williams [1].

Restrictions:
The calculation time depends strongly on the highest excitation energy requested.

Running time:
Depends on the number of excited quasiparticles requested for the particle-hole state density calculation, on the energy accuracy of the single-particle level scheme and on the number of particles and number of single-particle levels. In the example where total and particle-hole state densities have been calculated up to 15 MeV for a 60Ni nucleus, the running time was 2 min using Microsoft Power Station 4.0 optimizing compiler in a Pentium class microcomputer running at 800 MHz.

References:
[1] F.C. Williams Jr., Nucl. Phys. A133, 33 (1969).