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29 Result(s)

within I. J. D. MacGregor Remove this filter Nuclear Fusion Remove this filter Particle and Nuclear Physics Remove this filter

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  1. No Access

    Article

    The angular distribution of the 12C(γ,pn) reaction for Eγ=120−150 MeV

    The angular distribution of nucleons emitted in the 12C(γ,pn) reaction has been measured using tagged photons at the Mainz microtron MAMI. The variation of the reaction strength with the polar angles of the two ...

    T.T.-H. Yau, I.J.D. MacGregor, J. Ahrens… in The European Physical Journal A - Hadrons … (1998)

  2. No Access

    Article

    Threshold enhancement in η photoproduction from 2H and 4He

    The photoproduction of η-mesons from 2H and 4He has been studied for energies close to the production thresholds. The experiments were carried out with the tagged photon beam of the Mainz MAMI accelerator. The η-...

    V. Hejny, J. Weiß, P. Achenbach, J. Ahrens… in The European Physical Journal A - Hadrons … (2002)

  3. No Access

    Article

    Photoproduction of πmesons from nuclei

    Photoproduction of neutral pions from nuclei (carbon, calcium, niobium, lead) has been studied for incident-photon energies from 200 MeV to 800 MeV with the TAPS detector using the Glasgow photon tagging spect...

    B. Krusche, J. Lehr, J. Ahrens… in The European Physical Journal A - Hadrons … (2004)

  4. No Access

    Article

    Measurement of the πmeson polarizabilities via the γp → γπ+n reaction

    An experiment on the radiative π{+}-meson photoproduction from the proton ( γp → γπ{+}n) was carried out at the Mainz Microtron MAMI in the kinematic region 537MeV < Eγ < 817MeV, 140°≤

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

  5. No Access

    Article

    Measurement of the electric form factor of the neutron at Q2 = 0.3-0.8 (GeV/ c) 2 ⋆

    The electric form factor of the neutron, GE,n, has been measured at the Mainz Microtron by recoil polarimetry in the quasielastic D(¯e, e’¯n)p reaction. Three data points have been extracted at squared four-momen...

    D. I. Glazier, M. Seimetz, J. R. M. Annand… in The European Physical Journal A - Hadrons … (2005)

  6. No Access

    Article

    First measurements of the 16O(e, e'pn)14N reaction

    This paper reports on the first measurement of the 16O(e, e'pn)14N reaction. Data were measured in kinematics centred on a super-parallel geometry at energy and momentum transfers of 215MeV and 316MeV/c. The expe...

    D. G. Middleton, J. R. M. Annand… in The European Physical Journal A - Hadrons … (2006)

  7. Article

    First measurements of the 16O(e, e'pn)14N reaction

    D. G. Middleton, J. R. M. Annand… in The European Physical Journal A - Hadrons … (2006)

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  8. No Access

    Article

    Double pion photoproduction off 40Ca

    The photoproduction of π 0 π 0 and π 0 π ± pairs off 40Ca has been investigated with the TAPS detector using the Glasgow photon tagging spectrometer at the Mainz MAMI accelerator. Data have been taken for inciden...

    F. Bloch, J. Ahrens, J. R. M. Annand, R. Beck, L. S. Fog… in The European Physical Journal A (2007)

  9. No Access

    Article

    Determination of the Dalitz plot parameter \( \alpha\) for the decay \( \eta\) → 3 \( \pi^{0}_{}\) with the Crystal Ball at MAMI-B

    A precise measurement of the Dalitz plot parameter, \( \alpha\) , for the

    M. Unverzagt, P. Aguar-Bartolomé, J. Ahrens… in The European Physical Journal A (2009)

  10. No Access

    Article

    Photoproduction of \( \pi^{0}_{}\) \( \eta\) on protons and the \( \Delta\) (1700)D33 -resonance

    Total and differential cross-sections for the reaction \(\ensuremath \gamma p\rightarrow\pi^0\eta p\) have been measure...

    V. L. Kashevarov, A. Fix, P. Aguar-Bartolomé… in The European Physical Journal A (2009)

  11. No Access

    Article

    Knockout of proton-neutron pairs from 16O with electromagnetic probes

    After recent improvements to the Pavia model of two-nucleon knockout from 16O with electromagnetic probes the calculated cross-sections are compared to experimental data from such reactions. Comparison with data ...

    D. G. Middleton, J. R. M. Annand, C. Barbieri, C. Giusti… in The European Physical Journal A (2010)

  12. No Access

    Article

    Radiative π0 photoproduction on protons in the Δ+ (1232) region

    The reaction γp → pπ 0γ′ has been measured with the Crystal Ball/TAPS detectors using the energy-tagged photon beam at the electron accelerator facility MAMI-B. Energy and angular differen...

    S. Schumann, B. Boillat, E. J. Downie… in The European Physical Journal A (2010)

  13. No Access

    Article

    Photoproduction of π0π0 - and π0π+ -pairs off the proton from threshold to the second resonance region

    Precise total cross-sections and invariant-mass distributions have been measured for photoproduction of pion pairs off the proton producing ...

    F. Zehr, B. Krusche, P. Aguar, J. Ahrens… in The European Physical Journal A (2012)

  14. Article

    Open Access

    Deep exclusive π+ electroproduction off the proton at CLAS

    The exclusive electroproduction of π + above the resonance region was studied using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Laboratory by scattering a 6GeV continuous e...

    K. Park, M. Guidal, R. W. Gothe, J. M. Laget, M. Garçon… in The European Physical Journal A (2013)

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  15. No Access

    Article

    Coherent photoproduction of π0- and η-mesons off 7Li

    Coherent photoproduction of π0-mesons from threshold (E th ≈ 136 MeV) throughout the Δ-resonance region and of η-mesons close to the production threshold (E ...

    Y. Maghrbi, B. Krusche, J. Ahrens, J. R. M. Annand… in The European Physical Journal A (2013)

  16. Article

    Open Access

    Measurements of 12C \((\vec{\gamma},pp)\) photon asymmetries for \(E_{\gamma}=200\) –450 MeV

    The 12C \((\vec{\gamma},pp)\) reaction has been studied in the photon energy range 200-450 MeV at the Mainz microtron MA...

    J. Robinson, I. J. D. MacGregor, J. R. M. Annand… in The European Physical Journal A (2013)

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  17. No Access

    Article

    In-medium modifications of the ω meson near the production threshold

    The in-medium properties of the ω meson were investigated at the MAMI-C electron accelerator using the Crystal Ball/TAPS detector system to identify ω mesons through their ω → π 0 ...

    M. Thiel, V. Metag, P. Aguar Bartolome, L. K. Akasoy… in The European Physical Journal A (2013)

  18. Article

    Open Access

    Quasi-free photoproduction of η-mesons off 3He nuclei

    Quasi-free photoproduction of η-mesons has been measured off nucleons bound in 3He nuclei for incident photon energies from the threshold region up to 1.4 GeV. The experiment was performed at the tagged photon fa...

    L. Witthauer, D. Werthmüller, I. Keshelashvili… in The European Physical Journal A (2013)

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  19. Article

    Open Access

    Measurement of the beam-helicity asymmetry I⊙ in the photoproduction of \( \pi^{0}\) \( \pi^{\pm}\) pairs off protons and off neutrons

    Beam-helicity asymmetries have been measured at the MAMI accelerator in Mainz for the photoproduction of mixed-charge pion pairs in the reactions ...

    M. Oberle, J. Ahrens, J. R. M. Annand, H. J. Arends… in The European Physical Journal A (2014)

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  20. No Access

    Article

    Determination of the \( \eta\) mass with the Crystal Ball at MAMI-B

    A new precise determination of the \( \eta\) meson mass is presented. It is based on a measurement of the threshold for...

    A. Nikolaev, P. Aguar-Bartolomé, J. Ahrens… in The European Physical Journal A (2014)

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