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Article
Measurement of the beam asymmetry in η photoproduction off the proton
The beam asymmetry, Σ , was measured at ELSA in the reaction \( \boldsymbol\gamma\) p → ηp using linear...
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Article
Measurement of the G asymmetry for the γp↦Nπ channels in the Δ(1232) resonance region
The G asymmetry of the γp↦Nπ reaction has been measured for the first time for Eγ = 340±14 MeV. This observable, for which very scarce published data exist, plays an important role to disentangle the contribution...
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Article
First measurement of the helicity-dependent γ p↦pη differential cross-section
The helicity dependence of the γ p↦pη reaction has been measured for the first time at a center-of-mass angle θ* η = 70° in the photon energ...
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Article
Measurement of the η production in proton-proton collisions with the COSY time-of-flight spectrometer
The reaction pp → ppη was measured at excess energies of 15 and 41 MeV at an external target of the Jülich Cooler Synchrotron COSY with the time-of-flight spectrometer. About 25000 events were measured for the ex...
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Chapter and Conference Paper
The Bonn Frozen Spin Target for Experiments with Real Photons
At the new Bonn Electron Stretcher Accelerator ELSA scattering experiments with real photons in the single pion photoproduction γ N → π N and in the photodisintegration of the deuteron γ N pn are prepared. To det...
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Chapter and Conference Paper
Polarization Behaviour of NH3 at 3.5 Tesla and in the Frozen Spin Mode
With The the new Bonn Frozen Spin Target we investigated the polarization behaviour of 14NH3 in a magnetic field of 3.54 Tesla and at a temperature of 70 mK. We got a maximum polarization of +94 ±2.5% at a fre...
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Chapter and Conference Paper
Butanol in the Frozen Spin Mode
Measurements of the polarization build-up in butanol at 3.5 T are presented. Measurements of the proton relaxation times in the frozen spin mode were performed at magnetic fields of 0.5 and 0.35 Tesla, leading...
