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A careful reanalysis of both Argonne National Laboratory and BrookhavenNational Laboratory data for weak single pion production is done. We considerdeuteron nuclear effects and normalization (flux) uncertainties in bothexperiments. We demonstrate that these two sets of data are in good agreement.For the dipole parametrization of $C_5^A(Q^2)$, we obtain $C_5^A(0)=1.19\pm0.08$, $M_A=0.94\pm 0.03$ GeV. As an application we present the discussion ofthe uncertainty of the neutral current 1$\pi^0$ production cross section,important for the T2K neutrino oscillation experiment.

$C_5^A$ axial form factor from bubble chamber experiments