https://doi.org/10.1140/epja/i2017-12247-0
Regular Article - Experimental Physics
Photoproduction of 
mesons from the neutron: Cross sections and double polarization observable E
1
Department of Physics, University of Basel, CH-4056, Basel, Switzerland
2
Helmholtz-Institut für Strahlen- und Kernphysik der Universität Bonn, Bonn, Germany
3
Physikalisches Institut, Universität Bonn, Bonn, Germany
4
National Research Centre “Kurchatov Institute”, Petersburg Nuclear Physics Institute, Gatchina, Russia
5
Institut für Experimentalphysik I, Ruhr-Universität Bochum, Bochum, Germany
6
Department of Physics, Florida State University, Tallahassee, FL, USA
7
II. Physikalisches Institut, Universität Giessen, Giessen, Germany
* e-mail: Bernd.Krusche@unibas.ch
Received:
6
August
2016
Accepted:
1
March
2017
Published online:
23
March
2017
Results from measurements of the photoproduction of mesons from quasifree protons and neutrons are summarized. The experiments were performed with the CBELSA/TAPS detector at the electron accelerator ELSA in Bonn using the 
decay. A liquid deuterium target was used for the measurement of total cross sections and angular distributions. The results confirm earlier measurements from Bonn and the MAMI facility in Mainz about the existence of a narrow structure in the excitation function of 
. The current angular distributions show a forward-backward asymmetry, which was previously not seen, but was predicted by model calculations including an additional narrow 
state. Furthermore, data obtained with a longitudinally polarized, deuterated butanol target and a circularly polarized photon beam were analyzed to determine the double polarization observable E. Both data sets together were also used to extract the helicity-dependent cross sections 
and 
. The narrow structure in the excitation function of appears associated with the helicity-1/2 component of the reaction.
© SIF, Springer-Verlag Berlin Heidelberg, 2017
