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Manuscript Title: Program package for calculating matrix elements of two-cluster structures in nuclei.
Authors: R. Krivec, M.V. Mihailovic
Program title: STOKER
Catalogue identifier: AAOH_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 28(1982)153
Programming language: Fortran.
Computer: CDC CYBER 172.
Operating system: NOS/BE 1.3.
RAM: 120K words
Word size: 60
Peripherals: disc.
Keywords: Nuclear physics, Structure, Cluster model, Symbolic algebra, Symbolic-numerical Information conversion, Word addressable files.
Classification: 17.21.

Nature of problem:
In the cluster model, the matrix elements of operators between Slater determinants of cluster structures must be evaluated by symbolic algebra programs because of their length and number. They are the building blocks for the matrix elements between nuclear eigenfunctions of total angular momentum and parity. Therefore the symbolic expressions have to be converted to an equivalent set of numerical data and the latter stored for easy access (by program PRO2C).

Solution method:
A special set of subprograms reads and interprets the symbolic expressions. The numerical information so obtained is written into a a file with CDC Word Addressable organization in a space-saving form. Parts of information belonging to given operators and bra-ket clustering pairs can be accessed using pointers stored in the beginning of the file. Program STOKER can update the file many times.

Restrictions are imposed by the symbolic expressions interpreting subprogram package. The expressions can have at most 99 terms (of the form expotential function times a polynomial in several variables) and the powers of variables in polynomials can be one-digit only. A polynomial can be at most 1000 characters long (80 characters per card). These restrictions can be removed.

Unusual features:
A disk file with CDC Word Addressable organization is used (with the Record Manager routines).

Running time:
1.0 s for the test run.