Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 26: Electromagnetic and Hadronic Probes III

HK 26.4: Talk

Wednesday, March 13, 2002, 12:00–12:15, D

Near-threshold π⁰ production from the neutron in d(γ,π⁰n)p — •D.L. Hornidge — University of Saskatshewan, Saskatoon, Canada — Johannes Gutenberg–Universität, Mainz

A significant body of experimental results now exists for the proton photo-pion amplitudes near threshold and is in good agreement with ChPT predictions. Due to the experimental intricacies involved, there is a clear lack of data in the threshold region for the neutron. Preliminary attempts to determine the neutron amplitudes using the coherent production from the deuteron were hampered by the difficulties in separating out nuclear effects. For these reasons, a measurement of π⁰ photoproduction in the threshold region from the neutron via the d(γ,π⁰n)p reaction channel has been performed using the Mainz Microtron (MAMI). Photons in the energy range E_γ=95.7−208.5 MeV were tagged using the Glasgow tagger, the TAPS spectrometer was employed to detect the neutral-pion decay photons, and a segmented liquid-scintillator detector covering the angular range θ_n = 21.5^∘± 8.5^∘, φ_n = 0.0^∘± 8.5^∘ was used to detect recoil neutrons under quasi-free kinematical conditions. Preliminary results will be presented.