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arxiv: nucl-ex/0505012 · v2 · pith:QXZQK4VVnew · submitted 2005-05-11 · ⚛️ nucl-ex

Measurement of the asymmetries in 3He(e,e'p)d and 3He(e,e'p)np

P. Achenbach , D. Baumann , R. Boehm , B. Boillat , D. Bosnar , C. Carasco , M. Ding , M. O. Distler
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J. Friedrich W. Gloeckle J. Golak Y. Goussev P. Grabmayr W. Heil A. Huegli P. Jennewein G. Jover Manas J. Jourdan H. Kamada T. Klechneva B. Krusche K. W. Krygier J. G. Llongo M. Lloyd M. Makek H. Merkel C. Micheli U. Mueller A. Nogga R. Neuhausen Ch. Normand L. Nungesser A. Ott E. Otten F. Parpan R. Perez Benito M. Potokar D. Rohe D. Rudersdorf J. Schmiedeskamp M. Seimetz I. Sick S. Sirca R. Skibinski S. Stave G. Testa R. Trojer Th. Walcher M. Weis H. Witala H. Woehrle
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keywords breakupparallelfinalinteractionsperpendicularpolarizedscatteredstate
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The electron-target-asymmetries A_parallel and A_perpendicular with target spin parallel and perpendicular to the momentum transfer q were measured for both the two-- and three-body breakup of 3He in the 3He(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.

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