Programs in Physics & Physical Chemistry
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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|
|Keywords: Shell model, Nuclear physics, Structure, Second quantization, General reduction Formula.|
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.
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.
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.
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.
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