Dispersive effects from a comparison of electron and positron scattering from <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>12</mn></mrow></msup></mrow><mi mathvariant="normal">C</mi></math></span>

P. Guèye; M. Bernheim; J. F. Danel; J. E. Ducret; L. Lakéhal-Ayat; J. M. Le Goff; A. Magnon; C. Marchand; J. Morgenstern; J. Marroncle; P. Vernin; A. Zghiche-Lakéhal-Ayat; V. Breton; S. Frullani; F. Garibaldi; F. Ghio; M. Jodice; D. B. Isabelle; Z. E. Meziani; E. Offermann; M. Traini

doi:10.1103/PhysRevC.57.2107

Dispersive effects from a comparison of electron and positron scattering from $^{12} C$

P. Guèye, M. Bernheim, J. F. Danel, J. E. Ducret, L. Lakéhal-Ayat, J. M. Le Goff, A. Magnon, C. Marchand, J. Morgenstern, J. Marroncle, P. Vernin, A. Zghiche-Lakéhal-Ayat, V. Breton, S. Frullani, F. Garibaldi, F. Ghio, M. Jodice, D. B. Isabelle, Z. E. Meziani, E. Offermann, and M. Traini

Phys. Rev. C 57, 2107 – Published 1 May 1998

Abstract

Dispersive effects have been investigated by comparing elastic scattering of electrons and positrons from $^{12} C$ at the Saclay Linear Accelerator. The results demonstrate that dispersive effects at energies of 262 MeV and 450 MeV are less than 2% below the first diffraction minimum $[0.95 < q_{eff} ({fm}^{- 1}) < 1.66$ ] in agreement with the prediction of Friar and Rosen. At the position of this minimum ${(q}_{eff} = 1.84 {fm}^{- 1})$ , the deviation between the positron scattering cross section and the cross section derived from the electron results is $- 44 % \pm 30 %$ .

Received 14 May 1997

DOI:https://doi.org/10.1103/PhysRevC.57.2107

Authors & Affiliations

P. Guèye^*, M. Bernheim, J. F. Danel, J. E. Ducret, L. Lakéhal-Ayat, J. M. Le Goff^†, A. Magnon^†, C. Marchand, J. Morgenstern, J. Marroncle, P. Vernin, and A. Zghiche-Lakéhal-Ayat^‡

Service de Physique Nucléaire, DAPNIA-CEA, Centre d’Etudes de Saclay, 91191 Gif-sur-Yvette, Cedex, France

V. Breton

Laboratoire de Physique Corpusculaire, Université Blaise Pascal, Institut de Physique Nucléaire et de Physique des Particules, 63177 Aubière, Cedex, France

S. Frullani, F. Garibaldi, F. Ghio, and M. Jodice

Laboratori di Fisica, Istituto Superiore di Sanità e Istituto di Fisica Nucleare, Sezione Sanità, I-00161 Roma, Italy

D. B. Isabelle

Centre d’Etudes et de Recherche par Irradiation, Centre National de la Recherche Scientifique, 45071 Orléans, Cedex 02, France

Z. E. Meziani

Department of Physics, Temple University, Philadelphia, Pennsylvania 19122

E. Offermann

Thomas Jefferson National Accelerator Accelerator Facility (TJNAF), 12000 Jefferson Avenue, Newport News, Virginia 23606

M. Traini

Dipartimento di Fisica, Università degli Studi di Trento, I-38050 Povo (Trento), Italy
Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Trento, Trento, Italy

^*Present address: Hampton University, Nuclear High Energy Physics Center, Hampton, VA 23606.
^†Present address: Div. PPE, CERN, CH-1211, Geneva 23, Switzerland.
^‡Present address: Center de Recherches Nucléaires Cronenbourg, 67037 Strasbourg, Cédex, France.

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Vol. 57, Iss. 5 — May 1998

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