The G0 Experiment: Apparatus for Parity-Violating Electron Scattering   Measurements at Forward and Backward Angles

G0 Collaboration: D. Androic; D.S. Armstrong; J. Arvieux; R.; Asaturyan; T. D. Averett; S. L. Bailey; G. Batigne; D. H. Beck; E. J. Beise,; J. Benesch; F. Benmokhtar; L. Bimbot; J. Birchall; A. Biselli; P. Bosted; H.; Breuer; P. Brindza; C. L. Capuano; R. D. Carlini; R. Carr; N. Chant; Y.-C.; Chao; R. Clark; A. Coppens; S. D. Covrig; A. Cowley; D. Dale; C. A. Davis; C.; Ellis; W. R. Falk; H. Fenker; J. M. Finn; T. Forest; G. Franklin; R.; Frascaria; C. Furget; D. Gaskell; M. T. W. Gericke; J. Grames; K. A.; Griffioen; K. Grimm; G. Guillard; B. Guillon; H. Guler; K. Gustafsson; L.; Hannelius; J. Hansknecht; R. D. Hasty; A. M. Hawthorne Allen; T. Horn; T. M.; Ito; K. Johnston; M. Jones; P. Kammel; R. Kazimi; P. M. King; A. Kolarkar; E.; Korkmaz; W. Korsch; S. Kox; J. Kuhn; J. Lachniet; R. Laszewski; L. Lee; J.; Lenoble; E. Liatard; J. Liu; A. Lung; G. A. MacLachlan; J. Mammei; D.; Marchand; J. W. Martin; D. J. Mack; K. W. McFarlane; D. W. McKee; R. D.; McKeown; F. Merchez; M. Mihovilovic; A. Micherdzinska; H. Mkrtchyan; B.; Moffit; M. Morlet; M. Muether; J. Musson; K. Nakahara; R. Neveling; S.; Niccolai; D. Nilsson; S. Ong; S. A. Page; V. Papavassiliou; S. F. Pate; S. K.; Phillips; P. Pillot; M. L. Pitt; M. Poelker; T. A. Porcelli; G. Quemener; B.; P. Quinn; W. D. Ramsay; A. W. Rauf; J.-S. Real; T. Ries; J. Roche P. Roos; G.; A. Rutledge; J. Schaub; J. Secrest; T. Seva; N. Simicevic; G. R. Smith; D. T.; Spayde; S. Stepanyan; M. Stutzman; R. Suleiman; V. Tadevosyan; R. Tieulent,; J. van de Wiele; W. T. H. van Oers; M. Versteegen; E. Voutier; W. F. Vulcan,; S. P. Wells; G. Warren; S. E. Williamson; R. J. Woo; S. A. Wood; C. Yan; J.; Yun; V. Zeps

arXiv:1103.0761·nucl-ex·June 29, 2011

The G0 Experiment: Apparatus for Parity-Violating Electron Scattering Measurements at Forward and Backward Angles

G0 Collaboration: D. Androic, D.S. Armstrong, J. Arvieux, R., Asaturyan, T. D. Averett, S. L. Bailey, G. Batigne, D. H. Beck, E. J. Beise,, J. Benesch, F. Benmokhtar, L. Bimbot, J. Birchall, A. Biselli, P. Bosted, H., Breuer, P. Brindza, C. L. Capuano, R. D. Carlini, R. Carr

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TL;DR

The G0 experiment at Jefferson Lab measures tiny parity-violating asymmetries in electron scattering to explore the nucleon's neutral weak currents, utilizing a specialized apparatus with advanced detection and control systems.

Contribution

This paper details the design and performance of a novel experimental apparatus for precise parity-violating electron scattering measurements.

Findings

01

Successful detection of asymmetries as small as 1 ppm

02

Development of specialized beam-monitoring and control systems

03

Implementation of a superconducting toroidal magnetic spectrometer

Abstract

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 Cerenkov detectors, as well as fast readout electronics for the measurement of individual events. The overall design and performance of this experimental system is discussed.

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