Double-differential cross sections of the Fe-54,Fe-56(n, p) reactions
have been measured at 97 MeV in the angular range 0-30-degrees for exc
itation energies up to 40 MeV. The spectra have been decomposed into d
ifferent multipolarities by a technique based on the use of sample ang
ular distributions calculated within the distorted-wave Born approxima
tion. From the identified Gamow-Teller strength, S(beta)+ values were
obtained for Fe-54 Fe and Fe-56. Comparisons with available shell-mode
l calculations of the GT strength were made. The results are important
for models of supernova explosions since electron-capture rates, whic
h are proportional to S(beta)+, in 1f2p-shell nuclei affect the dynami
cs of the star. At higher excitation energies, the spectra are dominat
ed by L = 1 strength in broad distributions with a maximum at about 12
MeV. Microscopic calculations based on the random-phase approximation
were performed and compared with the experimental data.