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Sökning: WFRF:(Reichert G. A.) > (2000-2004)

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1.
  • Ahrens, J, et al. (författare)
  • First measurement of the helicity-dependent (gamma)over-right-arrow(p)over-right-arrow -> p eta differential cross-section
  • 2003
  • Ingår i: European Physical Journal A. Hadrons and Nuclei. - : Springer. - 1434-6001. ; 17:2, s. 241-244
  • Tidskriftsartikel (refereegranskat)abstract
    • The helicity dependence of the (γ) over right arrow(p) over right arrow -+ peta reaction has been measured for the first time at a center-of-mass angle theta(eta)*= 70degrees in the photon energy range from 780 MeV to 790 MeV. The experiment, performed at the Mainz microtron MAMI, used a 4pi-detector system, a circularly polarized, tagged photon beam. and a longitudinally polarized frozen-spin target. The helicity 3/2 cross-section is found to be small and the results for helicity 1/2 agree with predictions from the MAID analysis.
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2.
  • Ahrens, J, et al. (författare)
  • Helicity amplitudes A(1/2) and A(3/2) for the D-13(1520) resonance obtained from the (gamma)over-right-arrow(p)over-right-arrow -> p pi(0) reaction
  • 2002
  • Ingår i: Physical Review Letters. - : American Physical Society. - 1079-7114. ; 88:23
  • Tidskriftsartikel (refereegranskat)abstract
    • The helicity dependence of the (γ) over right arrow(p) over right arrow -->ppi(0) reaction has been measured for the first time in the photon-energy range from 550 to 790 MeV. The experiment, performed at the Mainz microtron MAMI, used a 4pi -detector system, a circularly polarized, tagged photon beam, and a longitudinally polarized frozen-spin target. These data are predominantly sensitive to the D-13(1520) resonance and are used to determine its helicity amplitudes.
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3.
  • Ahrens, J, et al. (författare)
  • Helicity dependence of the (gamma)over-right-arrow (p)over-right-arrow -> n pi(+) pi(0) reaction in the second resonance region
  • 2003
  • Ingår i: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. - : Elsevier. - 0370-2693. ; 551:1-2, s. 49-55
  • Tidskriftsartikel (refereegranskat)abstract
    • The helicity dependence of the total cross section for the (γ) over right arrow(p) over right arrownpi(+) pi(0) reaction has been measured for the first time at incident photon energies from 400 to 800 MeV The measurement was performed with the large acceptance detector DAPHNE at the tagged photon beam facility of the MAMI accelerator in Mainz. This channel is found to be excited predominantly when the photon and proton have a parallel spin orientation, due to the intermediate production of the D-13 resonance. (C) 2002 Elsevier Science B.V. All rights reserved.
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4.
  • Ahrens, J, et al. (författare)
  • Helicity dependence of the gamma p -> N pi channels and multipole analysis in the Delta region
  • 2004
  • Ingår i: European Physical Journal A. Hadrons and Nuclei. - : Springer. - 1434-6001. ; 21:2, s. 323-333
  • Tidskriftsartikel (refereegranskat)abstract
    • A high-quality double-polarization data set for the helicity dependence of the total and differential cross-sections for both gammap --> Npi channels in the Delta region has been obtained in the framework of the GDH experiment. The experiment, performed at the Mainz microtron MAMI, used a 4pi detection system, a circularly polarized photon beam, and a longitudinally polarized frozen-spin target. These data are included in the database to perform a multipole analysis to determine the properties of the Delta(1232)-resonance. For the resonant Delta(1232) multipoles we find a very good agreement with previous analyses, while the nonresonant ones show significant deviations.
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  • Resultat 1-4 av 4
 
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