Coulomb distortion measurements by comparing electron and positron quasielastic scattering off <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> and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>208</mn></mrow></msup></mrow><mi mathvariant="normal">Pb</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. Iodice; D. B. Isabelle; Z.-E. Meziani; E. Offermann; M. Traini

doi:10.1103/PhysRevC.60.044308

Coulomb distortion measurements by comparing electron and positron quasielastic scattering off $^{12} C$ and $^{208} Pb$

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. Iodice, D. B. Isabelle, Z.-E. Meziani, E. Offermann, and M. Traini

Phys. Rev. C 60, 044308 – Published 8 September 1999

Abstract

Positron and electron quasielastic cross sections on $^{12} C$ and $^{208} Pb$ were measured at the Saclay linear accelerator (ALS) to test Coulomb corrections to the plane-wave Born approximation. The positron and electron response functions at the same effective kinematics were found to be equal within a 3% experimental uncertainty, which allows us to discriminate between different theoretical models of Coulomb distortions. Our result strongly supports the effective momentum approximation, even for nuclei as heavy as $^{208} Pb$ .

Received 17 May 1999

DOI:https://doi.org/10.1103/PhysRevC.60.044308

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^†

DAPNIA, Service de Physique Nucléaire, CEA-Saclay, F-91191 Gif-Sur-Yvette, Cedex, France

V. Breton

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

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

Laboratorio 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, F-45071 Orléans, Cedex 02, France

Z.-E. Meziani

Department of Physics, Temple University, Philadelphia, Pennsylvania 19122

E. Offermann^§

Thomas Jefferson National 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
INFN, G.C. Trento, Italy

^*Present address: Hampton University, Nuclear/High Energy Physics Research Center, Hampton, VA 23606.
^†Present address: Center de Recherches Nucléaires Cronenbourg, F-67037 Strasbourg, Cédex, France.
^‡Deceased.
^§Present address: Renaissance Technologies Corp., 600 Rt. 25A, East Setauket, NY 11733.

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Vol. 60, Iss. 4 — October 1999

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