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The precise momentum dependence of the superconducting gap in theiron-arsenide superconductor with Tc = 32K (BKFA) was determined fromangle-resolved photoemission spectroscopy (ARPES) via fitting the distributionof the quasiparticle density to a model. The model incorporates finite lifetimeand experimental resolution effects, as well as accounts for peculiarities ofBKFA electronic structure. We have found that the value of the superconductinggap is practically the same for the inner Gamma-barrel, X-pocket, and"blade"-pocket, and equals 9 meV, while the gap on the outer Gamma-barrel isestimated to be less than 4 meV, resulting in 2Delta/kT_c=6.8 for the largegap, and 2Delta/kT_c<3 for the small gap. A large (77 \pm 3%)non-superconducting component in the photoemission signal is observed belowT_c. Details of gap extraction from ARPES data are discussed in Appendix.

Momentum dependence of the superconducting gap in Ba$_{1-x}$K$_{x}$Fe$_2$As$_2$