Through a sequence of large scale shell model calculations, total
Gamow-Teller strengths (S+ and S−) in 54Fe and 56Fe are
obtained. They reproduce the experimental values once the στ operator
is quenched by the standard factor of 0.77. Comparisons are made with recent
Shell Model Monte Carlo calculations. Results are shown to depend critically on
the interaction. From an analysis of the GT+ and GT− strength functions it is
concluded that experimental evidence is consistent with the 3(N−Z) sum rule.Comment: 6 pages, RevTeX 3.0 using psfig, 7 Postscript figures included using
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