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  1. No Access

    Chapter and Conference Paper

    The Bonn Frozen Spin Target for Experiments with Real Photons

    At the new Bonn Electron Stretcher Accelerator ELSA scattering experiments with real photons in the single pion photoproduction γ N → π N and in the photodisintegration of the deuteron γ N pn are prepared. To det...

    H. Dutz, S. Goertz, D. Krämer, W. Meyer, G. Reicherz… in High Energy Spin Physics (1991)

  2. No Access

    Chapter and Conference Paper

    Polarization Behaviour of NH3 at 3.5 Tesla and in the Frozen Spin Mode

    With The the new Bonn Frozen Spin Target we investigated the polarization behaviour of 14NH3 in a magnetic field of 3.54 Tesla and at a temperature of 70 mK. We got a maximum polarization of +94 ±2.5% at a fre...

    K. H. Althoff, H. Dutz, S. Goertz, D. Krämer, W. Meyer… in High Energy Spin Physics (1991)

  3. No Access

    Chapter and Conference Paper

    Butanol in the Frozen Spin Mode

    Measurements of the polarization build-up in butanol at 3.5 T are presented. Measurements of the proton relaxation times in the frozen spin mode were performed at magnetic fields of 0.5 and 0.35 Tesla, leading...

    H. Dutz, S. Goertz, D. Krämer, W. Meyer, L. Reichertz… in High Energy Spin Physics (1991)

  4. No Access

    Article

    Measurement of the η production in proton-proton collisions with the COSY time-of-flight spectrometer

    The reaction pp → ppη was measured at excess energies of 15 and 41 MeV at an external target of the Jülich Cooler Synchrotron COSY with the time-of-flight spectrometer. About 25000 events were measured for the ex...

    M. Abdel-Bary, S. Abdel-Samad, R. Bilger… in The European Physical Journal A - Hadrons … (2003)

  5. No Access

    Article

    First measurement of the helicity-dependent γ p↦pη differential cross-section

    The helicity dependence of the γ p↦pη reaction has been measured for the first time at a center-of-mass angle θ* η = 70° in the photon energ...

    J. Ahrens, S. Altieri, J.R.M. Annand… in The European Physical Journal A - Hadrons … (2003)

  6. No Access

    Article

    Measurement of the G asymmetry for the γp↦Nπ channels in the Δ(1232) resonance region

    The G asymmetry of the γp↦Nπ reaction has been measured for the first time for Eγ = 340±14 MeV. This observable, for which very scarce published data exist, plays an important role to disentangle the contribution...

    J. Ahrens, S. Altieri, J. R. M. Annand… in The European Physical Journal A - Hadrons … (2005)

  7. No Access

    Article

    Measurement of the beam asymmetry in η photoproduction off the proton

    The beam asymmetry, Σ , was measured at ELSA in the reaction \( \boldsymbol\gamma\) p → ηp using linear...

    D. Elsner, A. V. Anisovich, G. Anton, J. C. S. Bacelar… in The European Physical Journal A (2007)

  8. No Access

    Article

    First measurement of the helicity dependence for the γp → pπreaction

    The helicity dependence of the total cross-section and the invariant-mass distributions in the (pπ±) and (π+π-) final states for the γp → pπ+π- reaction have been measured for the first time at incident photon en...

    J. Ahrens, S. Altieri, J. R. M. Annand, H. -J. Arends… in The European Physical Journal A (2007)

  9. No Access

    Chapter and Conference Paper

    Measurement of the beam asymmetry Σ in π 0 η production off the proton with the CBELSA/TAPS experiment

    In photoproduction experiments, a large number of final states yielding various resonance contributions are accessible. To extract resonance parameters via partial-wave analysis not only the measurement of dif...

    E. Gutz, V. Sokhoyan, H. van Pee, A. V. Anisovich, J. C. S. Bacelar… in NSTAR 2007 (2008)

  10. No Access

    Article

    Nucleon resonance decay by the K0Σchannel

    Hyperon production off the proton in the K 0Σ+ channel has been studied at the tagged-photon beam facility at the ELSA electron accelerator in Bonn. This experiment was part of a series of neutral...

    R. Castelijns, A. V. Anisovich, J. C. S. Bacelar… in The European Physical Journal A (2008)

  11. No Access

    Article

    Measurement of the beam asymmetry Σ in πeta; production off the proton with the CBELSA/TAPS experiment⋆

    In photoproduction experiments, a large number of final states yielding various resonance contributions are accessible. To extract resonance parameters via partial-wave analysis not only the measurement of dif...

    E. Gutz, V. Sokhoyan, H. van Pee, A. V. Anisovich… in The European Physical Journal A (2008)

  12. No Access

    Article

    K0πand K*0Σ+ photoproduction off the proton

    The exclusive reactions γp → K *0Σ+(1189) and γp → K 0π0Σ+(1189) , leading to the p 4π0 final state, have been measured with a tagged photon beam for incident energ...

    M. Nanova, J. C. S. Bacelar, B. Bantes, O. Bartholomy… in The European Physical Journal A (2008)

  13. No Access

    Article

    Photoproduction of η -mesons off nuclei for Eγ ⩽ 2.2 GeV

    The photoproduction of η -mesons off 12C , 40Ca , 93Nb , and nat Pb nuclei has been measured with a tagged photon beam with energies between 0.6 and 2.2GeV. The experiment was p...

    T. Mertens, I. Jaegle, P. Mühlich, J. C. S. Bacelar… in The European Physical Journal A (2008)

  14. No Access

    Article

    Helicity dependence of the \( \gamma\) d \( \rightarrow\) \( \pi\) NN reactions in the \( \Delta\) -resonance region

    The helicity dependence of the differential cross-section for the \( \gamma\) d ...

    J. Ahrens, S. Altieri, J. R. M. Annand, H. -J. Arends… in The European Physical Journal A (2010)

  15. Article

    Open Access

    Photoproduction of \( \eta{^\prime}\) -mesons off the deuteron

    Quasi-free photoproduction of \( \eta{^\prime}\) -mesons off nucleons bound in the deuteron has been measured with the ...

    I. Jaegle, T. Mertens, A. Fix, F. Huang, K. Nakayama… in The European Physical Journal A (2011)

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  16. Article

    Open Access

    Photoproduction of \( \omega\) mesons on nuclei near the production threshold

    The photoproduction of \( \omega\) mesons on LH2 , C and Nb has been measured for incident photon energies from 900 to ...

    M. Nanova, J. Weil, S. Friedrich, V. Metag, U. Mosel… in The European Physical Journal A (2011)

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  17. No Access

    Article

    Measurement of the helicity-dependent total cross-section for the \( \gamma\) n \( \rightarrow\) p \( \pi^{-}_{}\) \( \pi^{0}_{}\) reaction

    The helicity dependence of the total cross-section for the \( \gamma\) n \( \rightarrow\) ...

    J. Ahrens, S. Altieri, J. R. M. Annand, H. -J. Arends… in The European Physical Journal A (2011)

  18. No Access

    Article

    Quasi-free photoproduction of η-mesons off the deuteron

    Precise data for quasi-free photoproduction of η-mesons off the deuteron have been measured at the Bonn ELSA accelerator with the combined Crystal Barrel/TAPS detector for incident photon energies up to 2.5GeV. T...

    I. Jaegle, B. Krusche, A. V. Anisovich, J. C. S. Bacelar… in The European Physical Journal A (2011)

  19. No Access

    Article

    High statistics study of the reaction γp → pπ0 η

    Photoproduction off protons of the pπ 0 η three-body final state was studied with the Crystal Barrel/TAPS detector, at the electron stretcher accelerator ELSA in Bonn, for incident...

    E. Gutz, V. Crede, V. Sokhoyan, H. van Pee… in The European Physical Journal A (2014)

  20. No Access

    Article

    Photoproduction of ω mesons off protons and neutrons

    ω photoproduction off hydrogen and deuterium has been studied with the tagged photon beam of the ELSA accelerator in Bonn for photon energies up to 2.0 GeV. The ω meson has been identified via th...

    F. Dietz, V. Metag, A. V. Anisovich, J. C. S. Bacelar… in The European Physical Journal A (2015)

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