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Manuscript Title: RITSSCHIL: a new program for shell-model calculations.
Authors: D. Zwarts
Program title: RITSSCHIL
Catalogue identifier: AADA_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 38(1985)365
Programming language: Fortran.
Computer: CDC 175-100.
Operating system: NOS/BE 1.5.
Program overlaid: yes
RAM: 47K words
Word size: 60
Peripherals: disc.
Keywords: Shell model, Nuclear physics, Structure, Second quantization, General reduction Formula.
Classification: 17.19.

Nature of problem:
A new program for nuclear (or atomic) shell-model calculations is described. In comparison with other presently available shell-model codes, the new program, called RITSSCHIL, can treat a larger variety of operators and it is more flexible. The reduced matrix elements of tensorial shell-model operators are calculated in a multi-shell space for nuclear (or atomic) shell-model states.

Solution method:
With the use of the general reduction formula the matrix elements are expanded in terms of single-shell matrix elements and the elementary matrix elements that describe the operator.

Restrictions:
The program is suitable for all tensorial shell-model operators. The number of active shells is limited only by a user. The order in which the active shells are coupled can be defined by input cards.

Running time:
The running time depends strongly on the number of active shells and on the dimensions of the computed matrices. For the test run on a CDC 175- 100 computer 31 s of CPU time was required.