Measurement of the neutron electric form factor GE,n in the quasifree 2H(e→,e′n→)p reaction

Ostrick, M. et al. (1999) Measurement of the neutron electric form factor GE,n in the quasifree 2H(e→,e′n→)p reaction. Physical Review Letters, 83(2), pp. 276-279. (doi: 10.1103/PhysRevLett.83.276)

Abstract

The electric form factor of the neutron G E , n has been measured in the quasifree 2 H ( → e , e ′ → n ) p reaction using the 855 MeV polarized cw electron beam of the Mainz Microtron MAMI. The polarization of the scattered neutrons was analyzed in a polarimeter consisting of two walls of plastic scintillators. The precession of the neutron spin in a magnetic field was used for the first time to circumvent the measurement of the effective analyzing power of the polarimeter and the beam polarization. In this way G E , n could be determined with little model dependence and experimental uncertainties. The result G E , n ( 0.34 GeV 2 / c 2 ) = 0.0611 ± 0.0069 stat ( { + 0.0069 } { − 0.0055 } ) syst is larger than previously assumed.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Livingston, Dr Kenneth and Owens, Professor Robert and Ireland, Professor David and Annand, Dr John and Kellie, Dr James
• Authors: Ostrick, M., Herberg, C., Andresen, H. G., Annand, J. R. M., Aulenbacher, K., Becker, J., Drescher, P., Eyl, D., Frey, A., Grabmayr, P., Hartmann, P., Hehl, T., Heil, W., Hoffmann, J., Ireland, D., Kellie, J. D., Klein, F., Livingston, K., Nachtigall, C., Natter, A., Otten, E. W., Owens, R. O., Reichert, E., Rohe, D., Schmieden, H., Sprengard, R., Steigerwald, M., Steffens, K.-H., Walcher, T., and Watson, R.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review Letters
• Publisher: American Physical Society
• ISSN: 0031-9007
• ISSN (Online): 1079-7114