R. Castelijns

Systematic investigation of the elastic proton-deuteron differential cross section at intermediate energies

To investigate the importance of three-nucleon forces (3NF) systematically over a broad range of intermediate energies, the differential cross sections of elastic proton-deuteron scattering have been measured at proton bombarding energies of 108, 120, 135, 150, 170, and 190 MeV at c.m. angles between 30degrees and 170degrees . Comparisons with Faddeev calculations show unambiguously the shortcomings of calculations employing only two-body forces and the necessity of including 3NF. They also show the limitations of the latest few-nucleon calculations at backward angles, especially at higher beam energies. Some of these discrepancies could be partially due to relativistic effects. Data at lowest energy are also compared with a recent calculation based on chiPT .

Linearly polarised photon beams at ELSA and measurement of the beam asymmetry in \pi^{0}_{} photoproduction off the proton

At the electron accelerator ELSA a linearly polarised tagged photon beam is produced by coherent bremsstrahlung off a diamond crystal. Orientation and energy range of the linear polarisation can be deliberately chosen by accurate positioning of the crystal with a goniometer. The degree of polarisation is determined by the form of the scattered electron spectrum. Good agreement between experiment and expectations on the basis of the experimental conditions is obtained. Polarisation degrees of

Proton-deuteron radiative capture cross-sections at intermediate energies

ensuremath P_{gamma}=40

Nucleon resonance decay by theK 0Σ+ channel: Preliminary results

% are typically achieved at half of the primary electron energy. The determination of

Nucleon resonance decay by the K-0 Sigma(+) channel : Preliminary results

ensuremath P_{gamma}

Proton-proton bremsstrahlung towards the elastic limit

is confirmed by measuring the beam asymmetry,

Dilepton and double-photon production in proton-proton scattering at 190 MeV

Sigma

Virtual Bremsstrahlung in Proton-Proton Scattering

, in

Systematic investigation of three-nucleon force effects in elastic scattering of polarized protons from deuterons at intermediate energies

pi^{0}_{}

Three nucleon force effects in cross section and spin observables of elastic deuteron proton scattering at 90 MeV / nucleon

photoproduction and by a comparison of the results to independent measurements using laser backscattering.