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LARGE ACCEPTANCE DETECTORS
FOR ELECTROMAGNETIC NUCLEAR PHYSICS
V.D. Burkert and B.A. Mecking
Physics Division
Continuous Electron Beam Accelerator Facility
Newport News, Virginia 23606, USA
ABSTRACT
The physics program and the requirements for large acceptance de-
tectors in electromagnetic nuclear physics are discussed. As a specific
example, the CEBAF Large Acceptance Spectrometer is presented.
A. INTRODUCTION
Electron scattering experiments have provided most of our knowledge of the
structure of nucleons and nuclei. The standard experimental equipment at elec-
tron accelerators consists of focusing magnetic spectrometers to detect the scat-
tered electron (sometimes in coincidence with a second charged particle). The
main advantage of these spectrometers is the high resolution (that relies on the
use of carefully arranged magnetic fields) and the low sensitivity of the particle
detector system to background (the detectors are located in a well shielded en-
closure far away from both target and beam). The disadvantage, however, is the
small acceptance in both solid angle and momentum which limits the experiments
in practice to the coincident detection of two (perhaps, in selected cases, three)
particles. A further drawback is the massive iron structure which limits the mini-
mum angle between the detected particles and makes a continuous coverage of the
available phase space impossible. For the coincident detection of several particles
in the final state, the ideal solution is a detector capable of covering the complete
solid angle and momentum range of interest for all outgoing charged and neutral
particles.
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Mecking, Bernhard & Burkert, Volker. Large Acceptance Detectors for Electromagnetic Nuclear Physics, book, February 1, 1991; [Newport News, Virginia]. (https://digital.library.unt.edu/ark:/67531/metadc928825/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.