V. L. Kashevarov, P. Ott, S. Prakhov, P. Adlarson, F. Afzal, Z. Ahmed, C. S. Akondi, J. R. M. Annand, H. J. Arends, R. Beck, A. Braghieri, W. J. Briscoe, F. Cividini, R. Codling, C. Collicott, S. Costanza, A. Denig, E. J. Downie, M. Dieterle, M. I. Ferretti Bondy, L. V. Fil’kov, A. Fix, S. Gardner, S. Garni, D. I. Glazier, D. Glowa, W. Gradl, G. Gurevich, D. J. Hamilton, D. Hornidge, D. Howdle, G. M. Huber, A. Käser, S. Kay, I. Keshelashvili, R. Kondratiev, M. Korolija, B. Krusche, J. Linturi, V. Lisin, K. Livingston, I. J. D. MacGregor, R. MacRae, J. Mancell, D. M. Manley, P. P. Martel, J. C. McGeorge, E. McNicol, D. G. Middleton, R. Miskimen, E. Mornacchi, C. Mullen, A. Mushkarenkov, A. Neiser, M. Oberle, M. Ostrick, P. B. Otte, B. Oussena, D. Paudyal, P. Pedroni, V. V. Polyanski, A. Rajabi, G. Reicherz, J. Robinson, G. Rosner, T. Rostomyan, A. Sarty, D. M. Schott, S. Schumann, C. Sfienti, V. Sokhoyan, K. Spieker, O. Steffen, B. Strandberg, I. I. Strakovsky, Th. Strub, I. Supek, M. F. Taragin, A. Thiel, M. Thiel, L. Tiator, A. Thomas, M. Unverzagt, S. Wagner, D. P. Watts, D. Werthmüller, J. Wettig, L. Witthauer, M. Wolfes, R. L. Workman, and L. Zana

The gamma p -> pi(0) p reaction was studied at laboratory photon energies from 425 to 1445 MeV with a transversely polarized target and a longitudinally polarized beam. The beam-target asymmetry F was measured for the first time and new high precision data for the target asymmetry T were obtained. The experiment was performed at the photon tagging facility of the Mainz Microtron (MAMI) using the Crystal Ball and TAPS photon spectrometers. The polarized cross sections were expanded in terms of associated Legendre functions and compared to recent predictions from several partial-wave analyses. The impact of the new data on our understanding of the underlying partial-wave amplitudes and baryon resonance contributions is discussed.

The first data on target and beam-target asymmetries for the $\gamma p\to\pi^0\eta p$ reaction at photon energies from 1050 up to 1450 MeV are presented. The measurements were performed using the Crystal Ball and TAPS detector setup at the Glasgow tagged photon facility of the Mainz Microtron MAMI. The general assumption that the reaction is dominated by the $\Delta 3/2^-$ amplitude is confirmed. The data are in particular sensitive to small contributions from other partial waves.

Polarisation-dependent differential cross sections σT associated with the target asymmetry T have been measured for the reaction γp→→pπ0 with transverse target polarisation from π0 threshold to photon energies of 190 MeV. The data were obtained using a frozen-spin butanol target with the Crystal Ball / TAPS detector set-up and the Glasgow photon tagging system at the Mainz Microtron MAMI. Results for σT have been used in combination with our previous measurements of the unpolarised cross section σ0 and the beam asymmetry Σ for a model-independent determination of S- and P-wave multipoles in the π0 threshold region, which includes for the first time a direct determination of the imaginary part of the E0+ multipole.

Differential cross sections for the gamma p -> pi(0)p reaction have been measured with the A2 tagged-photon facilities at the Mainz Microtron, MAMI C, up to the center-of-mass energy W = 1.9 GeV. The new results, obtained with a fine energy and angular binning, increase the existing quantity of pi(0) photoproduction data by similar to 47%. Owing to the unprecedented statistical accuracy and the full angular coverage, the results are sensitive to high partial-wave amplitudes. This is demonstrated by the decomposition of the differential cross sections in terms of Legendre polynomials and by further comparison to model predictions. A new solution of the SAID partial-wave analysis obtained after adding the new data into the fit is presented.

The first data on target and beam-target asymmetries for the gamma p -> pi(0)eta p reaction at photon energies from 1050 up to 1450 MeV are presented. The measurements were performed using the Crystal Ball and TAPS detector setup at the Glasgow tagged photon facility of the Mainz Microtron MAMI. The general assumption that the reaction is dominated by the Delta 3/2-amplitude is confirmed. The data are in particular sensitive to small contributions from other partial waves.

The collimated spectra of polarization bremsstrahlung (PB) produced by 7MeV electrons in Al, Ni, Cu, Mo and W poly crystalline foils are measured and the angular dependences of the PB characteristics are studied. A comparison of the experimental results with theoretical predictions is performed. Polarization bremsstrahlung sensitivity to texture and grain size of the target in the backscattering geometry is shown. The possibility of developing a new method based on the characteristics measurement of the coherent PB component for the diagnostics of polycrystalline materials is considered.