A focal plane system for the 855 MeV tagged photon spectrometer at MAMI-B

Hall, S.J.; Miller, G.J.; Beck, R.; Jennewein, P.

doi:10.1016/0168-9002(95)00661-3

Cited by 149 publications

(59 citation statements)

References 17 publications

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“…The resulting photon beam is collimated onto a target placed in the centre of the Crystal Ball detector (see section 2.3). The recoil bremsstrahlung electrons are energy-tagged in the Glasgow-Mainz Tagged Photon Spectrometer [3][4][5], allowing the energies of the photons to be determined on an event-by-event basis. The scattered electrons are momentum analysed in a large dipole magnet and are detected in a focal plane detector (FPD) consisting of 353 overlapping plastic scintillators.…”

Section: The Glasgow-mainz Photon Taggermentioning

confidence: 99%

Research with real photons at the MAMI 1.6 GeV electron accelerator

MacGregor

2014

EPJ Web of Conferences

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Abstract. The A2-CB Collaboration at Mainz is studying the structure of hadrons by meson photoproduction using unpolarised, linearly polarised and circularly polarised photons with energies up to 1.6 GeV. Photons are energy-tagged using the Glasgow-Mainz tagged photon spectrometer and a new high-energy end-point tagger which allows K' reactions to be studied. Reaction products are detected in a ~4S detector consisting of the Crystal Ball detector and TAPS forward wall. Transverse or longitudinally polarised proton targets are available and new techniques have been developed to measure the polarisation of recoiling protons. These facilities have allowed an extensive programme of double-polarisation meson-photoproduction experiments to be carried out to search for so-called "missing baryon resonances" on proton and deuteron targets. Searches have also been carried out to investigate narrow resonances in the K-photoproduction channel at invariant masses around 1680 MeV. Coherent S 0 production measurements have been used to estimate the neutron skin thickness in 208 Pb. This paper presents selected highlights from the A2-CB collaboration research programme at MAMI.

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Section: The Glasgow-mainz Photon Taggermentioning

confidence: 99%

Research with real photons at the MAMI 1.6 GeV electron accelerator

MacGregor

2014

EPJ Web of Conferences

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“…The recoiled electrons are deflected in the magnet of the Glasgow photon tagger [21,22] where their energy E e − is measured in the focal plane detectors with a resolution of ≈ 2 MeV FWHM. In this way, the energy of the photons can be calculated as E γ = E 0 − E e − .…”

Section: Coherent π 0 Photoproduction and Experimental Setupmentioning

confidence: 99%

Neutron skin studies in heavy nuclei with coherent p0 photo-production

Bondy¹

2015

Proceedings of 53rd International Winter Meeting on Nuclear Physics — PoS(Bormio2015)

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The charge distribution of nuclei is known with very high accuracy, i.e. in electron scattering experiments, conversely, the mass distribution is experimentally less accessible and therefore less precisely known. An accurate determination of the neutron density distribution is of particular interest. Especially in nuclei with N » Z, a strong neutron skin is expected, since the excess neutrons are pushed outwards against surface tension by the Coulomb forces. With the precise experimental determination of the neutron skin thickness essential constraints for the nuclear equation of state (EOS) can be provided and thus allowing to draw conclusions on the size of neutron stars. The method of coherent π 0 photoproduction, A(γ, π 0 )A, provides a powerful tool to determine the mass distribution of various nuclei. In a novel experimental campaign carried out in 2012 within the A2 collaboration at the Mainz Microtron (MAMI), five nuclei have been measured: 58 Ni, 116,120,124 Sn, 208 Pb. The tin targets are of special interest because most of the systematic errors due to pion-nucleon interaction can be neglected, and they allow a precise investigation along an isotopic chain. First results of these studies will be discussed.

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“…However, even changes of polarizabilities by 100% and more are still compatible with the present error bars. The experiment discussed here has been performed at the continuous-wave electron accelerator MAMI B [25,26] using Glasgow-Edinburgh-Mainz tagger photon facility [1,2]. The quasi-monochromatic photon beam covered the energy range from 537 to 819 MeV with an intensity ∼ 6 × 10 5 /s in the tagger channel for the lowest photon energy and average energy resolution of 2 MeV.…”

Section: Pion Polarizabilitymentioning

confidence: 99%

“…A measurement of the reaction p( γ, π 0 )p [39] was performed at the Mainz Microtron MAMI [40] using the Glasgow/Mainz tagged photon facility [1,2] and the photon spectrometer TAPS [4]. The MAMI accelerator delivered a continuous wave beam of 405 MeV electrons.…”

Section: Pion Polarizabilitymentioning

confidence: 99%

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Experiments with photons at MAMI

Beck¹

Many Body Structure of Strongly Interacting Systems

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Abstract. A very successful experimental program with real photons has been achieved in 20 years of operation at the Mainz Microtron (MAMI) facility. The different detector setups, like DAPHNE, TAPS and the Crystal Ball are centered around the tagged photon facility the so-called Glasgow Tagger. From the rich spectrum of results only a few highlights will be discussed here, the proton polarizabilities, the pion polarizabilities, pion photoproduction close to the pion threshold and in the ∆(1232)-resonance region.

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A focal plane system for the 855 MeV tagged photon spectrometer at MAMI-B

Cited by 149 publications

References 17 publications

Research with real photons at the MAMI 1.6 GeV electron accelerator

Research with real photons at the MAMI 1.6 GeV electron accelerator

Neutron skin studies in heavy nuclei with coherent p0 photo-production

Experiments with photons at MAMI

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