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Manuscript Title: Coefficients of fractional parentage in j-j coupling in the isospin representation.
Authors: L.B. Hubbard
Program title: JJTCFP
Catalogue identifier: ABKB_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 1(1970)225
Programming language: Fortran.
Computer: IBM-360/75, IBM 91.
Operating system: 0S360.
RAM: 43K words
Word size: 32
Keywords: Nuclear physics, Cfp, Fractional parentage, Angular momentum, Wave function, J-j coupling.
Classification: 17.18.

Nature of problem:
The program JJTCFP evaluates the coefficients of fractional parentage, c.f.p., in the j-j coupling scheme for eigenstates of seniority, i-spin and total angular momentum. This program is applicable to any shell and can be used for fermions of only one type such as electrons.

Solution method:
The program JJTCFP uses a recursion relation to find the n-(n+1) c.f.p. from a table of (n-1)-n c.f.p. As a result, the program is not suitable as a subroutine, but could be used in an overlaid configuration.

This program is directly applicable to any j-j shell in the i-spin formalism or in maximum i-spin only. However, the dimension of the arrays must be increased if the program is to be used near the center of the shells for shells having j>=7/2.

Unusual features:
External sorting of output from one stage is required before it is used as input to the next stage.

Running time:
The sample output required less than one second on the IBM-360/91; compile time is a few seconds. The j=7/2 4-5 c.f.p. table (nearly 10000 c.f.p., about half of which were zero) required 2 minutes of execution on the same machine.