Measurement of the1H(γ,π0)cross section near threshold. II. Pion angular distributions

This paper represents a continuation of our earlier report on the measurement of the reaction ${}^1\mathrm{H}(\gamma ,{\pi }^0)$ in the threshold region (144.7–169.3 MeV). More specifically, we present pion angular distributions reconstructed using information on the ${\pi }^0$-decay photon energies not previously utilized. Analysis of these distributions reconfirms most of our previous conclusions. In particular, we confirm the rapid increase in the real part of the $S$-wave multipole, $\mathrm{Re}{E}_{0+},$ at energies above the ${\pi }^{+}$ threshold. New results for the $P$-wave amplitude $P_1$ are presented.