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Published December 10, 2001 | Published
Journal Article Open

Precision Measurement of the Spin-Dependent Asymmetry in the Threshold Region of ^3He(e, e')


We present the first precision measurement of the spin-dependent asymmetry in the threshold region of ^3He(e,e′) at Q^2 values of 0.1 and 0.2(GeV/c)^2. The agreement between the data and nonrelativistic Faddeev calculations which include both final-state interactions and meson-exchange current effects is very good at Q^2 = 0.1(GeV/c)^2, while a small discrepancy at Q^2 = 0.2(GeV/c)^2 is observed.

Additional Information

© 2001 The American Physical Society. Received 1 July 2001; published 27 November 2001. We thank the Hall A technical staff and the Jefferson Lab Accelerator Division for their outstanding support during this experiment. We also thank T.W. Donnelly for many helpful discussions. This work was supported in part by the U.S. Department of Energy, DOE/EPSCoR, the U.S. National Science Foundation, the Science and Technology Cooperation Germany-Poland and the Polish Committee for Scientific Research, the Ministero dell'Università e della Ricerca Scientifica e Tecnologica (Murst), the French Commissariat à l'Énergie Atomique, Centre National de la Recherche Scientifique (CNRS), Conseil Régional d'Auvergne, the Italian Istituto Nazionale di Fisica Nucleare (INFN), and a grant of European Foundation Project No. INTAS-99-0125. This work was supported by DOE Contract No. DE-AC05-84ER40150 under which the Southeastern Universities Research Association (SURA) operates the Thomas Jefferson National Accelerator Facility. The numerical calculations were performed on the PVP machines at the U.S. National Energy Research Scientific Computer Center (NERSC) and the CRAY T90 of the NIC in Jülich.

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