Abstract.
Differential cross-sections for quasi-free \(\pi^0\) photoproduction from the proton and neutron bound in the deuteron have been measured for \(E_\gamma = 200\mbox{--}400\) MeV at \(\theta_\gamma^{\rm lab} = 136.2^\circ\) using the Glasgow photon tagger at MAMI, the Mainz 48 cm \(\clubsuit\times 64\) cm NaI(Tl) photon detector and the Göttingen SENECA recoil detector. For the proton measurements made with both liquid-deuterium and liquid-hydrogen targets allow direct comparison of “free” \(\pi^0\) photoproduction cross-sections as extracted from the bound-proton data with experimental free cross-sections which are found to be in reasonable agreement below 320 MeV. At higher energies the “free” cross-sections extracted from quasi-free data are significantly smaller than the experimental free cross-sections and theoretical predictions based on multipole analysis. For the first time, “free” neutron cross-section have been extracted in the \(\Delta\)-region. They are also in agreement with the predictions from multipole analysis up to 320 MeV and significantly smaller at higher photon energies.
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Communicated by R. Milner
Received: 28 May 2003, Published online: 27 January 2004
PACS:
13.60.Le Meson production - 14.20.Dh Protons and neutrons - 25.20.Lj Photoproduction reactions
K. Kossert: Part of the Doctoral Thesis.,Present address: Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany.
Present address F. Wissmann: Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany.
Present address B. Seitz: II. Physikalisches Institut der Universität Gießen, Germany.
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Kossert, K., Camen, M., Wissmann, F. et al. Quasi-free \(\pi^0\) photoproduction from the bound nucleon. Eur. Phys. J. A 19, 391–399 (2004). https://doi.org/10.1140/epja/i2003-10130-3
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DOI: https://doi.org/10.1140/epja/i2003-10130-3