The 1.5GeV harmonic double-sided microtron at Mainz University

Kaiser, K.-H.; Aulenbacher, K.; Chubarov, O.V.; Dehn, M.; Euteneuer, H.; Hagenbuck, F.; Herr, R. W.; Jankowiak, Andreas; Jennewein, P.; Kreidel, H. J.; Ludwig-Mertin, U.; Negrazus, M.; Ratschow, S.; Schumann, S.; Seidl, M.; Stephan, G.; Thomas, A.

doi:10.1016/j.nima.2008.05.018

Cited by 160 publications

(83 citation statements)

References 5 publications

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“…The Mainz Microtron MAMI [1] provides high-intensity, polarized electron beams up to 1.6 GeV. Quasi-monochromatic photons beams in the energy range from π 0 threshold up to the η threshold are produced via energy-tagging of bremsstrahlung using the Glasgow-Mainz tagging spectrometer [2] and a newly developed end-point tagging spectrometer [3].…”

Section: Tagged Photon Facility At Mamimentioning

confidence: 99%

Exciting Baryons with MAMI

Ostrick

2016

Proceedings of the 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015)

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Meson photoproduction is an important tool in baryon spectroscopy. In modern experiments all spin degrees of freedom can be exploited in order to determine partial wave amplitudes and resonance parameters. With the Crystal Ball/TAPS detector setup at the energy-tagged photon facility at the Mainz Microtron MAMI photoproduction can be studied up to the center-of-mass energy W = 1.9 GeV. Selected results for differential cross sections and transverse target asymmetries in π 0 , η and η production are presented.

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Section: Tagged Photon Facility At Mamimentioning

confidence: 99%

Exciting Baryons with MAMI

Ostrick

2016

Proceedings of the 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015)

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“…The experiment was performed at the MAMI C accelerator in Mainz [7] using the Glasgow-Mainz tagged photon facility [8]. The quasi-monochromatic photon beam covered the energy range from 700 to 1450 MeV.…”

Section: Experimental Setup and Data Analysismentioning

confidence: 99%

Experimental study ofηmeson photoproduction reaction at MAMI

Kashevarov

2015

EPJ Web of Conferences

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Abstract. New data for the differential cross sections, polarization observables T , F, and E in the reaction of η photoproduction on proton from the threshold up to a center-of-mass energy of W=1.9 GeV are presented. The data were obtained with the Crystal-Ball/TAPS detector setup at the Glasgow tagged photon facility of the Mainz Microtron MAMI. The polarization measurements were made using a frozen-spin butanol target and circularly polarized photon beam. The results are compared to existing experimental data and different PWA predictions. The data solve a long-standing problem related the angular dependence of older T data close to threshold. The unexpected relative phase motion between s-and d-wave amplitudes required by the old data is not confirmed. At higher energies, all model predictions fail to reproduce the new polarization data indicating a significant impact on our understanding of the underlying dynamics of η meson photoproduction. Furthermore, we present a fit of the new data and existing data from GRAAL for Σ asymmetry based on an expansion in terms of associated Legendre polynomials. A Legendre decomposition shows the sensitivity to small partialwave contributions. The sensitivity of the Legendre coefficients to the nucleon resonance parameters is shown using the ηMAID isobar model.

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“…The accelerator runs for 7000 hours per year, with each of the three A1, A2 and X1 collaborations taking beam consecutively. MAMI comprises an injection linac which provides injection for a series of three cascaded racetrack microtrons, followed by the world's only Harmonic Double Sided Microtron [1].…”

Section: Photon Beammentioning

confidence: 99%

Overview of baryon resonances

Downie

2014

EPJ Web of Conferences

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Abstract. The quest to understand the physics of any system cannot be said to be complete as long as one cannot predict and fully understand its resonance spectrum. Despite this, due to the experimental challenge of the required double polarization measurements and the difficulty in achieving unambiguous, model-independent extraction and interpretation of the nucleon resonance spectrum of many broad and overlapping resonances, understanding of the structure and dynamics of the nucleon has suffered. The recent improvement in statistical quality and kinematic range of the data made available by such full-solid-angle systems as the CB and TAPS constellation at MAMI, coupled with the high flux polarized photon beam provided by the Glasgow Photon Tagger, and the excellent properties of the Mainz Frozen Spin Target, when paired with new developments in Partial Wave Analysis (PWA) methodology make this a very exciting and fruitful time in nucleon resonance studies. Here the recent influx of data and PWA developments are summarized, and the requirements for a complete, unambiguous PWA solution over the first and second resonance region are briefly reviewed.

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The 1.5GeV harmonic double-sided microtron at Mainz University

Cited by 160 publications

References 5 publications

Exciting Baryons with MAMI

Exciting Baryons with MAMI

Experimental study ofηmeson photoproduction reaction at MAMI

Overview of baryon resonances

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