Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 1: Hadronenstruktur und -spektroskopie
HK 1.1: Gruppenbericht
Montag, 17. März 2014, 14:00–14:30, HZ 1+2
Photoproduction of π0-Mesons off Neutrons in the Nucleon Resonance Region — •Dieterle Manuel for the A2 collaboration — Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
Severe differences between the experimentally observed excitation spectrum of the nucleon and the theoretically predicted results require detailed investigation. Meson photoproduction offers the nice possibility to measure the electromagnetic properties of the nucleon and thereby provides stringent tests to the nucleon models.
π0 photoproduction is in particular interesting as neutral pions couple only weakly to photons so that non-resonant background contributions become negligible. Although pion photoproduction off the free proton is well known the isospin decomposition also requires measurements on the free neutron. However, this can only be investigated with quasi-free neutrons bound in light nuclei, i.e. the deuteron.
We will present final results of the first measurement of precise angular distributions for π0 photoproduction off neutrons bound in the deuteron. Effects from nuclear Fermi motion have been removed by a complete kinematic reconstruction of the final state. An attempt to remove the final state interactions reveals first conclusions about the reaction on the free neutron and will put stringent tests on future nucleon models.