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1.	Ahrens, J, et al. (author) Intermediate resonance excitation in the gamma p -> p pi(0)pi(0) reaction 2005 In: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. - : Elsevier BV. - 0370-2693. ; 624:3-4, s. 173-180 Journal article (peer-reviewed)abstract The helicity dependence of the total cross section for the (gamma) over right arrow(p) over right arrow -> p pi(0)pi(0) reaction has been measured for the first time at incident photon energies from 400 to 800 MeV. The measurement, performed at the tagged photon beam facility of the MAMI accelerator in Mainz, used the large acceptance detector DAPHNE and a longitudinally polarized frozen-spin target. This channel is found to be excited predominantly when the photon and proton have a parallel spin orientation, most likely due to the intermediate production of the D-13(1520) resonance. However, the contribution of the antiparallel spin configuration, arising from other reaction mechanisms, is also not negligible. This result gives important new information to resolve the existing model discrepancies in the identification of the nucleon resonances contributing to this channel.
2.	Dutz, H, et al. (author) Measurement of helicity-dependent photoabsorption cross sections on the neutron from 815 to 1825 MeV 2005 In: Physical Review Letters. - 1079-7114. ; 94 Journal article (peer-reviewed)abstract Helicity-dependent total photoabsorption cross sections on the deuteron have been measured for the first time at ELSA (Bonn) in the photon energy range from 815 to 1825 MeV. Circularly polarized tagged photons impinging on a longitudinally polarized LiD target have been used together with a highly efficient 4 pi detector system. The data around 1 GeV are not compatible with predictions from existing multipole analyses. From the measured energy range an experimental contribution to the GDH integral on the neutron of [33.9 +/- 5.5(stat)+/- 4.5(syst)] mu b is extracted.

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Type of publication: journal article (2)

Type of content: peer-reviewed (2)

Author/Editor: Hasegawa, S. (2); Schumacher, M. (2); Helbing, K. (2); Anton, G. (2); Lang, M. (2); Ahrens, J. (2); show more...; Grabmayr, P. (2); Krimmer, J (2); Thomas, A (2); Bradtke, C (2); Dutz, H (2); Hansen, Kurt (2); Naumann, J (2); Beck, R. (2); Horikawa, N. (2); d'Hose, N. (2); Iwata, T. (2); Klein, F. (2); Meyer, W. (2); Reicherz, G. (2); Braghieri, A. (2); Heid, E. (2); Kondratiev, R. (2); Lisin, V. (2); Pedroni, P. (2); Rostomyan, T. (2); Altieri, S (2); Annand, JRM (2); Arends, HJ (2); Goertz, S (2); Harmsen, J (2); Holvoet, H (2); Van Hoorebeke, L (2); Jennewein, P (2); Kiel, B (2); Lannoy, B (2); Leukel, R (2); Menze, D (2); Michel, T (2); Panzeri, A (2); Pinelli, T (2); Preobrajenski, I (2); Radtke, E (2); Rohlof, C (2); Sauer, M (2); Schoch, B (2); Speckner, T (2); Tamas, G (2); van de Vyver, R (2); Weihofen, W (2); show less...

University: Lund University (2)

Language: English (2)

Research subject (UKÄ/SCB): Natural sciences (2)

Year: 2005 (2)Undo refine

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