Current Status and Performance of the Crystal Ball and TAPS Calorimeter

Neiser, A.

doi:10.1088/1742-6596/587/1/012041

Cited by 34 publications

(1 citation statement)

References 7 publications

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“…The reaction products were then detected using the Crystal Ball/TAPS apparatus of the A2 Collaboration, covering nearly 97 % of the full solid angle. Further information about the A2 setup can be found in [6]. The measurements were performed with two different orientations of the photon polarization vector with a relative shift of 90 • in respect to each other.…”

Section: Introduction To Scalar Polarizabilitiesmentioning

confidence: 99%

Measurement of the proton scalar polarizabilities at MAMI

Mornacchi¹

2018

Proceedings of XVII International Conference on Hadron Spectroscopy and Structure — PoS(Hadron2017)

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The electric (α E1 ) and magnetic (β M1 ) scalar polarizabilities are fundamental properties related to the internal structure of the nucleon. They play a crucial role not only in our understanding of the nucleon, but also in other areas, such as atomic physics. In the past, the values of α E1 and β M1 were determined from the unpolarized differential cross-section of Compton scattering γ p → γ p. The measurement of the beam asymmetry Σ 3 provides an alternative approach to the extraction of the scalar polarizabilities with different sensitivity and systematics compared to the unpolarized cross-section. This asymmetry was measured for the first time below the pion photoproduction threshold by the A2 Collaboration with the Crystal Ball/TAPS experiment at MAMI (Mainz, Germany). A linearly polarized photon beam impinged on a liquid hydrogen target and the scattered photons were detected with the Crystal Ball/TAPS setup, providing almost 4π coverage. A new high precision measurement of both unpolarized cross-section and beam asymmetry Σ 3 will be performed in the near future and polarizabilities α E1 and β M1 will be extracted with unprecedented precision.

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Section: Introduction To Scalar Polarizabilitiesmentioning

confidence: 99%

Measurement of the proton scalar polarizabilities at MAMI

Mornacchi¹

2018

Proceedings of XVII International Conference on Hadron Spectroscopy and Structure — PoS(Hadron2017)

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Spin-Zero Polarimetry for Linearly Polarised Photons at MAMI

Powell

2020

J. Phys.: Conf. Ser.

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Background: The tagged Coherent Bremsstrahlung technique is used to provide beams of linearly polarised photons at several of the world’s leading photonuclear facilities, including MAMI in Mainz, ELSA at Bonn, and GlueX at Jefferson Laboratory. The degree of linear polarisation in real photon experiments has direct impact on measurements of polarisation observables. Measurement of the linear polarisation is often the biggest source of systematic error in these experiments. Continuous, in-beam measurement will also allow the beam position to be adjusted to optimise the polarisation. Purpose: To determine whether it is possible to make an improved measurement of the degree of linear polarisation using a polarimeter based on a 12C target. Methods: Coherent π0 meson production from a spin-zero nucleus has a photon asymmetry of 1 and hence provides a direct method of measuring the beam polarisation. Results: Current methods of measurement are being employed as a comparison. Simulated statistics of π0 mesons produced off the polarimeter suggest the measurement is viable. Early results from production data support the viability of live, event-by-event measurements of the polarisation using this method. Conclusions: A spin-zero nucleus such as carbon will be developed as a polarimeter for measuring the degree of linear polarisation in hadron physics experiments with tagged photons of up to 1557 MeV.

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Particle Detectors

Kolanoski

Wermes

2020

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The book describes the fundamentals of particle detectors in their different forms as well as their applications, presenting the abundant material as clearly as possible and as deeply as needed for a thorough understanding. The target group for the book are both, students who want to get an introduction or wish to deepen their knowledge on the subject as well as lecturers and researchers who intend to extent their expertise. The book is also suited as a preparation for instrumental work in nuclear, particle and astroparticle physics and in many other fields (addressed in chapter 2). The detection of elementary particles, nuclei and high-energetic electromagnetic radiation, in this book commonly designated as ‘particles’, proceeds through interactions of the particles with matter. A detector records signals originating from the interactions occurring in or near the detector and (in general) feeds them into an electronic data acquisition system. The book describes the various steps in this process, beginning with the relevant interactions with matter, then proceeding to their exploitation for different detector types like tracking detectors, detectors for particle identification, detectors for energy measurements, detectors in astroparticle experiments, and ending with a discussion of signal processing and data acquisition. Besides the introductory and overview chapters (chapters 1 and 2), the book is divided into five subject areas: – fundamentals (chapters 3 to 5), – detection of tracks of charged particles (chapters 6 to 9), – phenomena and methods mainly applied for particle identification (chapters 10 to 14), – energy measurement (accelerator and non-accelerator experiments) (chapters 15, 16), – electronics and data acquisition (chapters 17 and 18). Comprehensive lists of literature, keywords and abbreviations can be found at the end of the book.

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Current Status and Performance of the Crystal Ball and TAPS Calorimeter

Cited by 34 publications

References 7 publications

Measurement of the proton scalar polarizabilities at MAMI

Measurement of the proton scalar polarizabilities at MAMI

Spin-Zero Polarimetry for Linearly Polarised Photons at MAMI

Particle Detectors

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