Determination of the neutron electric form factor in quasielastic scattering of polarized electrons from polarized ³He

Creators: Jones-Woodward, C. E.; Beise, E. J.; Belz, J. E.; Carr, R. W.; Filippone, B. W.; Lorenzon, W.; McKeown, R. D.; Mueller, B. A.; O'Neill, T. G.; Dodson, G.; Dow, K.; Farkhondeh, M.; Kowalski, S.; Lee, K.; Makins, N.; Milner, R.; Thompson, A.; Tieger, D.; van den Brand, J. F. J.; Young, A.; Yu, X.; Zumbro, J. D.

Abstract

We report a measurement of the asymmetry in spin-dependent quasielastic scattering of longitudinally polarized electrons from a polarized ³He gas target. The asymmetry is measured at kinematics sensitive to the transverse-longitudinal response function RTL(Q2,ω). The value of the neutron electric form factor GEn(Q2=0.16 (GeV/c2))=+0.070±0.100±0.035 is extracted from the asymmetry using a Faddeev calculation of the ³He wave function.

Additional Information

© 1991 The American Physical Society. Received 3 April 1991. We would like to thank B. Blankleider and R. Woloshyn for providing us with their computer code. We also acknowledge the assistance of T. Gentile in checking the sign of the target polarization and H. Gao for calculating the pion correction. The research has been supported by National Science Foundation Grant No. PHY88-17296 (Caltech) and by the U.S. Department of Energy Contract No. DE-AC02-76ER03069 (MIT).

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