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Published August 1, 2011 | public
Journal Article

The G0 experiment: Apparatus for parity-violating electron scattering measurements at forward and backward angles


In the G0 experiment, performed at Jefferson Lab, the parity-violating elastic scattering of electrons from protons and quasi-elastic scattering from deuterons is measured in order to determine the neutral weak currents of the nucleon. Asymmetries as small as 1 part-per-million in the scattering of a polarized electron beam are determined using a dedicated apparatus. It consists of specialized beam monitoring and control systems, a cryogenic hydrogen (or deuterium) target, and a superconducting, toroidal magnetic spectrometer equipped with plastic scintillation and aerogel Cherenkov detectors, as well as fast readout electronics for the measurement of individual events. The overall design and performance of this experimental system is discussed.

Additional Information

© 2011 Elsevier B.V. Received 11 October 2010; revised 18 April 2011; accepted 19 April 2011. Available online 28 April 2011. This work is supported in part by grants from several agencies. The U.S. DOE provided support for the construction of the North American detectors, the North American electronics, for the infrastructure and operation of Jefferson Lab, as well as for the activities of some collaborating groups. The U.S. NSF provided funding for the superconducting magnet and the cryogenic target, as well as for the activities of some collaborating groups. The French CNRS provided support for the French detectors and electronics, as well as for the activities of the French collaborators. The Canadian NSERC provided support for the North American detectors and electronics as well as for the activities of the Canadian groups. We thank all the funding agencies for their support to the experiment. We would like to thank the administration and staff of Jefferson Laboratory, especially members of the Accelerator and Hall C groups who made strong contributions to the success of the experiment. We would also like to acknowledge the contributions of, and to thank the technical staff at Caltech (target), Carnegie Mellon (detectors, electronics), Grenoble (detectors, electronics), Illinois (magnet), Orsay (detectors, electronics), and TRIUMF (detectors, magnet).

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October 24, 2023