  Gamma-strength function essentially distinguishes the reaction mechanisms of
charged particle inelastic and neutron capture reactions, reflecting from the
ratios of transition of neutron capture to low-lying states. The extraordinary
quenching of gamma_0 transition of p-wave neutron resonance reaction in
3s-region nucleus 57Fe is observed, for the first time, due to the non-forming
2p-1h doorway state activation which raises the strong intensities of gamma_1
and gamma_2. The enhancement of low energy gamma-strength function doesn't
emerge in the neutron capture reaction resulting from the population of cascade
transitions of low-lying states rather than primary transitions. The
astrophysical reaction rates that are extracted from total and partial neutron
capture cross sections of 57Fe might be adopted to constrain the abundance of
the successive heavier isotopes in s-process.
