Pion electroproduction in the 3He(e,é π+)3H reaction at intermediate energies

✍ Scribed by K.I. Blomqvist; W.U. Boeglin; R. Böhm; M. Distler; R. Edelhoff; J. Friedrich; R. Geiges; M. Kahrau; S. Kamalov; M. Kirchbach; M. Kohl; M. Korn; H. Kramer; K.W. Krygier; V. Kunde; M. Kuss; J.M. Laget; A. Liesenfeld; K. Merle; R. Neuhausen; E.A.J.M. Offermann; Th. Pospischil; M. Potokar; C. Rangacharyulu; A. Richter; A.W. Richter; A. Rokavec; G. Rosner; P. Sauer; St. Schardt; G. Schrieder; T. Suda; L. Tiator; B. Vodenik; A. Wagner; Th. Walcher; St. Wolf

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 823 KB
• Volume: 626
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(97)00463-6

✦ Synopsis

The differential coincident pion electroproduction cross section in the 3He(e,e'zr+ )3H reaction has been measured with high resolution with the three-spectrometer set-up at the Mainz Microtron (MAMI) electron accelerator. Measurements were performed at the four incident energies Eo = 855, 675, 600, and 555 MeV at fixed four-momentum transfer Q2 = 0.045 GeV 2, with the pions detected in parallel kinematics. This enables a separation of the measured cross section into the transverse and longitudinal structure functions by means of the Rosenbluth method. The experimental data are compared to model calculations, in which the elementary pion production amplitude includes the standard Born-amplitudes and also delta and higher resonance terms. Threebody Fadeev wave functions are used and the final state interaction of the outgoing pion is taken into account. The calculation describes the data only after medium modifications of the delta and of the pion are included. (~) 1997 Elsevier Science B.V.