Frankfurt 2014 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 8: Hadronenstruktur und -spektroskopie
HK 8.7: Talk
Monday, March 17, 2014, 18:45–19:00, HZ 1+2
Helicity Dependent Cross Sections in Meson Photoproduction off Quasi-Free Protons and Neutrons — •Lilian Witthauer and Manuel Dieterle for the A2 collaboration — Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
Single and double polarization experiments of photoproduction reactions are a crucial step towards the complete experiment in order to reveal quantum numbers of the contributing nucleon resonances. Whereas there is much progress on the free proton the situation on the neutron is more complicated.
The longitudinally polarized deuterated butanol target and the high quality circularly polarized tagged photon beam at the electron accelerator facility MAMI in Mainz give the opportunity to measure helicity dependent photoproduction cross sections off quasi-free protons and neutrons. The combined detector setup of Crystal Ball and TAPS together with the charged particle identification detectors allows the registration of different mesons as η, 2π0, ηπ0 and even charged pions.
We will present helicity dependent cross sections σ1/2 (photon and target spin anti-parallel) and σ3/2 (photon and target spin parallel) and results for the double polarisation observable E off quasi-free protons and neutrons from a new experiment carried out at MAMI in Mainz.