Search results for "Electron Scattering"
showing 10 items of 105 documents
Operation and characterization of a windowless gas jet target in high-intensity electron beams
2021
Abstract A cryogenic supersonic gas jet target was developed for the MAGIX experiment at the high-intensity electron accelerator MESA. It will be operated as an internal, windowless target in the energy-recovering recirculation arc of the accelerator with different target gases, e.g., hydrogen, deuterium , helium, oxygen, argon, or xenon. Detailed studies have been carried out at the existing A1 multi-spectrometer facility at the electron accelerator MAMI. This paper focuses on the developed handling procedures and diagnostic tools, and on the performance of the gas jet target under beam conditions. Considering the special features of this type of target, it proves to be well suited for a n…
Silicon Detector Telescope for proton detection in electron scattering reactions at MAMI
2012
Abstract A new Silicon Detector Telescope has been constructed and installed within the experimental facility of the A1 collaboration at Mainz Microtron, with the goal to detect low-energy protons. It consists of seven silicon layers for energy and angle measurement and a plastic scintillator for triggering purposes. The detector subtends a solid angle up to 88 msr, depending on the distance from the target and covers the proton kinetic energy range of 25–41 MeV with the mean energy resolution σ E = 0.47 MeV , operating at 500 kHz. Digital signal processing methods applied for energy reconstruction have been important for keeping the acceptable energy resolution at high counting rates. The…
The electronion scattering experiment ELISe at the International Facility for Antiproton and Ion Research (FAIR) - A conceptual design study
2011
The electronion scattering experiment ELISe is part of the installations envisaged at the new experimental storage ring at the International Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany. It offers an unique opportunity to use electrons as probe in investigations of the structure of exotic nuclei. The conceptual design and the scientific challenges of ELISe are presented. © 2011 Elsevier B.V. All rights reserved.
The energy loss system of the electron scattering facility at the Mainz 300 MeV linear accelerator
1978
Abstract An energy loss system was constructed for the electron scattering facility at the Mainz 300 MeV linear accelerator with the aim of improving the energy resolution and increasing the useful beam current. The main features of the design are: (1) the existing system (conventional mode) is kept in full operation, (2) for the energy loss mode, the electron beam is deflected vertically downwards and then returned to the original beam line by the dispersion matching system, consisting of three dipole magnets and one quadrupole magnet, (3) the dispersion of the beam on the target can be tuned to the dispersion of the spectrometer with the aid of the quadrupole magnet. With the installation…
Electron Scattering Experiments on Light Nuclei
2020
In this contribution we discuss double-polarised quasi-elastic electron scattering from \({}^{3}\mathrm {He}\) and \({}^{12}\mathrm {C}\). For these nuclei precise data from recent experiments at Jefferson Lab and Mainz have become available, accompanied by a very strong theoretical effort dedicated to understanding these nuclei. The double polarisation experiments presented here offer insight into some of the details of the nuclear structure that could not be accessed by traditional cross-section measurements. The new experimental results show only rough agreement with the calculations and indicate that we do not yet fully understand the structure of these nuclei and nucleon dynamics insid…
What can be learnt about nuclear polarization from a consistency analysis ofe ? cross sections and muonic X-rays for208Pb and the isotone pair209Bi/2…
1977
A joint analysis of recent electron scattering cross sections and muonic atom X-ray energies is performed for208Pb and the isotone pair209Bi/208Pb. From the compatibility of the experimental data one can learn about the nuclear polarisation correction. However, we find this information not to be as accurate as other authors claimed when we take into consideration the ambiguities in the treatment of the corrections of the higher levels.
E0 suppression in pion photoproduction on 13C
1990
Abstract Recently measured anomalously low cross sections for 13 C(γ, π − ) 13 N at low energy and θ π lab = 90° 0761 have been analyzed in a DWIA calculation. It has been found that the EO contribution alone is able to explain the data, so that the M1 cross section is expected to vanish. Using constraints from recent magnetic electron scattering, an explanation is possible by assuming a significantly lower reduced density matrix element for spin-flip isovector transitions with angular momentum L = 2 than predicted by Cohen and Kurath.
The MESA Experimental Program: A Laboratory for Precision Physics with Electron Scattering at Low Energy
2021
A rich experimental program is currently being prepared at a new laboratory for high-intensity electron scattering at the Mainz Energy recovering Superconducting Accelerator (MESA). The physics pro...
Measurement of the proton and deuteron structure functions, F2p and F2d, and of the ratio
1997
The muon-proton and muon-deuteron inclusive deep inelastic scattering cross sections were measured in the kinematic range 0.002 < x < 0.60 and 0.5 < Q(2) < 75 GeV2 at incident muon energies of 90, 120, 200 and 280 GeV. These results are based on the full data set collected by the New Muon Collaboration, including the data taken with a small angle trigger. The extracted values of the structure functions F-2(p) and F-2(d) are in good agreement with those from other experiments. The data cover a sufficient range of y to allow the determination of the ratio of the longitudinally to transversely polarised virtual photon absorption cross sections, R = sigma(L)/sigma(T), for 0.002 < x < 0.12. The …
Strangeness of the nucleon
2005
Abstract Strangeness observables of the nucleon are discussed. Emphasis is put on the strange vector form factors as they are measured in current parity violating electron scattering experiments. Recent results are presented and the evidence for non-vanishing strangeness contributions is shown.