Eur. Phys. J. A (2005) 25: 177-183
https://doi.org/10.1140/epja/i2005-10115-2

Original Article

Measurement of the asymmetries in ³ (¯e, e^′p)d and ³ (¯e, e^′p)np

¹ Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Becherweg 45, D-55099, Mainz, Germany
² Departement für Physik und Astronomie, Universität Basel, Klingelbergstr. 82, 4056, Basel, Switzerland
³ Department of Physics, University of Zagreb, Bijenička c. 32, P.P. 331, 10002, Zagreb, Croatia
⁴ Institut für Theoretische Physik II, Ruhr-Universität Bochum, Universitätsstr. 150, D-44780, Bochum, Germany
⁵ M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30059, Kraków, Poland
⁶ Physikalisches Institut, Universität Tübingen, Auf der Morgenstelle 14, D-72076, Tübingen, Germany
⁷ Institut für Physik, Johannes Gutenberg-Universität, Staudingerweg 7, D-55099, Mainz, Germany
⁸ Department of Physics, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, 804-8550, Kitakyushu, Japan
⁹ Forschungszentrum Jülich, Institut für Theoretische Kernphysik, D-52425, Jülich, Germany
¹⁰ Institute Jožef Stefan, University of Ljubljana, Jamova 39, 1000, Ljubljana, Slovenia
¹¹ Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, MA, USA

^* e-mail: Daniela.Rohe@unibas.ch

Received: 16 May 2005
Accepted: 4 July 2005
Published online: 31 August 2005

Abstract

The electron target asymmetries A _|| and A _⊥ with target spin parallel and perpendicular to the momentum transfer were measured for both the two- and three-body breakup of ³He in the ³ (¯e, e’p)-reaction. Polarized electrons were scattered off polarized ³He in the quasielastic regime in parallel kinematics with the scattered electron and the knocked-out proton detected using the Three-Spectrometer Facility at MAMI. The results are compared to Faddeev calculations which take into account Final-State Interactions as well as Meson Exchange Currents. The experiment confirms the prediction of a large effect of Final-State Interactions in the asymmetry of the three-body breakup and of an almost negligible one for the two-body breakup.