5 research outputs found
The polarization observables T, P, and H and their impact on multipoles
Data on the polarization observables T, P, and H for the reaction are reported. Compared to earlier data from other experiments, our
data are more precise and extend the covered range in energy and angle
substantially. The results were extracted from azimuthal asymmetries measured
using a transversely polarized target and linearly polarized photons. The data
were taken at the Bonn electron stretcher accelerator ELSA with the CBELSA/TAPS
detector. Within the Bonn-Gatchina partial wave analysis, the new polarization
data lead to a significant narrowing of the error band for the multipoles for
neutral-pion photoproduction
Automated Quantification of Early Bone Alterations and Pathological Bone Turnover in Experimental Arthritis by in vivo PET/CT Imaging
Polarization observables in double neutral pion photoproduction
Measurements of target asymmetries and double-polarization observables for
the reaction are reported. The data were taken with
the CBELSA/TAPS experiment at the ELSA facility (Bonn University) using the
Bonn frozen-spin butanol (CHOH) target, which provided transversely
polarized protons. Linearly polarized photons were produced via bremsstrahlung
off a diamond crystal. The data cover the photon energy range from
=650 MeV to =2600 MeV and nearly the complete angular
range. The results have been included in the BnGa partial wave analysis.
Experimental results and the fit agree very well. Observed systematic
differences in the branching ratios for decays of and
resonances are attributed to the internal structure of these excited nucleon
states. Resonances which can be assigned to SU(6)O(3) two-oscillator
configurations show larger branching ratios to intermediate states with
non-zero intrinsic orbital angular momenta than resonances assigned to
one-oscillator configurations.Comment: 21 pages, 27 figure