21 research outputs found

    Dependence of the 12^{12}C(γ\vec{\gamma},pd) reaction on photon linear polarisation

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    The sensitivity of the 12^{12}C(γ,pd)(\vec{\gamma},pd) reaction to photon linear polarisation has been determined at MAMI, giving the first measurement of the reaction for a nucleus heavier than 3^{3}He. Photon asymmetries and cross sections were measured for EγE_{\gamma}=170 to 350 MeV. For EγE_{\gamma} below the Δ\Delta resonance, reactions leaving the residual 9^{9}Be near its ground state show a positive asymmetry of up to 0.3, similar to that observed for 3^{3}He suggesting a similar reaction mechanism for the two nuclei.Comment: 4 pages, 2 figure

    Measurements of 12C(→γ,pp) photon asymmetries for Eγ= 200–450 MeV

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    The 12C (→γ ,pp) reaction has been studied in the photon energy range 200-450 MeV at the Mainz microtron MAMI-C, where linearly polarised photons were energy-tagged using the Glasgow-Mainz Tagged Photon Spectrometer and protons were detected in the Crystal Ball detector. The photon asymmetry Σ has been measured over a wider Eγ range than previous measurements. The strongest asymmetries were found at low missing energies where direct emission of nucleon pairs is expected. Cuts on the difference in azimuthal angles of the two ejected protons increased the magnitude of the observed asymmetries. At low missing energies the Σ data exhibit a strong angular dependence, similar to deuteron photodisintegration

    ATLAS detector and physics performance: Technical Design Report, 1

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