Eur. Phys. J. A (2004) 19: 391-399
https://doi.org/10.1140/epja/i2003-10130-3

Quasi-free photoproduction from the bound nucleon

¹ II. Physikalisches Institut, Universität Göttingen, D-37073, Göttingen, Germany
² Institut für Kernphysik, Universität Mainz, D-55099, Mainz, Germany
³ Department of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
⁴ Physikalisches Institut, Universität Tübingen, D-72076, Tübingen, Germany
⁵ B.I. Stepanov Institute of Physics, Belarussian Academy of Sciences, 220072, Minsk, Belarus
⁶ P.N. Lebedev Physical Institute, 119991, Moscow, Russia

^* e-mail: schumacher@physik2.uni-goettingen.de

Abstract

Differential cross-sections for quasi-free photoproduction from the proton and neutron bound in the deuteron have been measured for MeV at using the Glasgow photon tagger at MAMI, the Mainz 48 cm 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” 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 -region. They are also in agreement with the predictions from multipole analysis up to 320 MeV and significantly smaller at higher photon energies.