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This paper presents a systematic evaluation of the ability of theoreticalmodels to reproduce experimental Gamow-Teller transition strength distributionsmeasured via (n,p)-type charge-exchange reactions at intermediate beamenergies. The focus is on transitions from stable nuclei in the pf shell(45<A<64). The impact of deviations between experimental and theoreticalGamow-Teller strength distributions on derived stellar electron-capture ratesat densities and temperatures of relevance for Type Ia and Type II supernovaeis investigated. The theoretical models included in the study are based on theshell-model, using the KB3G and GXPF1a interactions, and quasiparticlerandom-phase approximation (QRPA) using ground-state deformation parameters andmasses from the finite-range droplet model.

GT strengths and electron-capture rates for pf-shell nuclei of relevance for late stellar evolution