2020 Impact factor 3.043
Hadrons and Nuclei

Eur. Phys. J. A 12, 125-127 (2001)

Measurement of GEp/GMp via polarization transfer at Q2 = 0.4 GeV/c2

Th. Pospischil1, P. Bartsch1, D. Baumann1, R. Böhm1, K. Bohinc1, 2, M. Ding1, S. Derber1, M.O. Distler1, D. Elsner1, I. Ewald1, J. Friedrich1, J.M. Friedrich1, S. Grözinger1, S. Hedicke1, P. Jennewein1, J. Jourdan3, M. Kahrau1, F. Klein1, K.W. Krygier1, J. Lac4, A. Liesenfeld1, S. Malov4, J. McIntyre4, H. Merkel1, P. Merle1, U. Müller1, R. Neuhausen1, M. Potokar2, R.D. Ransome4, D. Rohe5, G. Rosner1, J. Sanner1, H. Schmieden1, M. Seimetz1, S. Sirca2, I. Sick3, O. Strähle1, A. Süle1, A. Wagner1, Th. Walcher1 and M. Weis1

1  A1 Collaboration, Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany
2  Institut Jozef Stefan, University of Ljubljana, SI-1001 Ljubljana, Slovenia
3  Departement für Physik und Astronomie, Universität Basel, CH-4056 Basel, Switzerland
4  Rutgers, The State University of New Jersey, Piscataway, New Jersey, USA
5  Institut für Physik, Universität Mainz, D-55099 Mainz, Germany


(Received: 26 July 2001 / Revised version: 18 September 2001 Communicated by M. Garçon)

The polarization transfer from longitudinally polarized electrons to protons in the elastic scattering $p(\overrightarrow{e} ,e'\overrightarrow{p} )$ has been measured around Q2 = 0.4 (GeV/c)2 with the three-spectrometer facility at the Mainz microtron MAMI. From this polarization transfer the ratio $G_{{\rm E}p}/(G_{{\rm M}p}/\mu_p)$ has been determined. The ratio is found to be slightly less than unity in agreement with recent results from other laboratories and from the Rosenbluth separation of cross-sections measured with unpolarized electrons.

25.30.Bf - Elastic electron scattering.
13.40.Gp - Electromagnetic form factors.
14.20.Dh - Protons and neutrons.
24.70.+s - Polarization phenomena in reactions.

© Società Italiana di Fisica, Springer-Verlag 2001