Cross Section for $\gamma n\to {\pi }^{0}n$ measured at Mainz/A2

Abstract

The $\gamma n\to {\pi }^{0}n$ differential cross section evaluated for 27 energy bins span the photon-energy range 290-813 MeV (W = 1.195-1.553 GeV) and the pion c.m. polar production angles, ranging from 18 deg to 162 deg, making use of model-dependent nuclear corrections to extract pi0 production data on the neutron from measurements on the deuteron target. Additionally, the total photoabsorption cross section was measured. The tagged photon beam produced by the 883-MeV electron beam of the Mainz Microtron MAMI was used for the 0-meson production. Our accumulation of 3.6 x 10^6 $\gamma n\to {\pi }^{0}n$ events allowed a detailed study of the reaction dynamics. Our data are in reasonable agreement with previous A2 measurements and extend them to lower energies. The data are compared to predictions of previous SAID, MAID, and BnGa partial-wave analyses and to the latest SAID fit MA19 that included our data. Selected photon decay amplitudes $N^{\ast }\to \gamma n$ at the resonance poles are determined for the first time.

arXiv comment16 pages, 12 figures, 3 tables

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• First concurrent extraction of the leading-order scalar and spin proton polarizabilities
• Differential Cross Sections for Neutron-Proton Scattering in the Region of the $d^{\ast }(2380)$ Dibaryon Resonance
• Single-energy partial wave analysis for pion photoproduction with fixed-t analyticity
• Radiative pion photoproduction in covariant chiral perturbation theory
• First measurement of polarisation transfer $C_{x^{\prime }}^n$ in deuteron photodisintegration
• The Gerasimov-Drell-Hearn sum-rule with nuclear targets
• New graphical criterion for the selection of complete sets of polarization observables and its application to single-meson photoproduction as well as electroproduction