# GCFP

A computer program for two-particle generalized coefficients of fractional parentage We present a FORTRAN90 program GCFP for the calculation of the generalized coefficients of fractional parentage (generalized CFPs or GCFP). The approach is based on the observation that the multi-shell CFPs can be expressed in terms of single-shell CFPs, while the latter can be readily calculated employing a simple enumeration scheme of antisymmetric $A$-particle states and an efficient method of construction of the idempotent matrix eigenvectors. The program provides fast calculation of GCFPs for a given particle number and produces results possessing numerical uncertainties below the desired tolerance. A single $j$-shell is defined by four quantum numbers, $(e,l,j,t)$. A supplemental C++ program parGCFP allows calculation to be done in batches and/or in parallel.

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