Effect of the Nuclear Medium on the Proton Investigated with the Reaction <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">C</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>12</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow><mo>(</mo><mi>e</mi><mo>,</mo><mrow><msup><mrow><mi>e</mi></mrow><mrow><mo>′</mo></mrow></msup></mrow><mi>p</mi><mo>)</mo><mrow><mmultiscripts><mrow><mi mathvariant="normal">B</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>11</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>

G. van der Steenhoven; H. P. Blok; J. F. J. van den Brand; T. de Forest, Jr; J. W. A. den Herder; E. Jans; P. H. M. Keizer; L. Lapikás; P. J. Mulders; E. N. M. Quint; P. K. A. de Witt Huberts; J. Mougey; S. Boffi; C. Giusti; F. D. Pacati

doi:10.1103/PhysRevLett.57.182

Effect of the Nuclear Medium on the Proton Investigated with the Reaction ${}^{12}C (e, e^{'} p) {}^{11}B$

G. van der Steenhoven, H. P. Blok, J. F. J. van den Brand, T. de Forest, Jr., J. W. A. den Herder, E. Jans, P. H. M. Keizer, L. Lapikás, P. J. Mulders, E. N. M. Quint, P. K. A. de Witt Huberts, J. Mougey, S. Boffi, C. Giusti, and F. D. Pacati

Phys. Rev. Lett. 57, 182 – Published 14 July 1986

Abstract

A longitudinal-transverse separation has been carried out for the coincident quasifree proton knockout reaction on ${}^{12}C$ in the range of three-momentum transfer 0.27-0.46 GeV/c. The deduced ratio of longitudinal and transverse response functions indicates a significant effect of the nuclear medium on the coupling of the virtual photon with the proton. The observed modification of this coupling implies a breakdown of the impulse approximation.

Received 20 February 1986

DOI:https://doi.org/10.1103/PhysRevLett.57.182

Authors & Affiliations

G. van der Steenhoven^1,2, H. P. Blok^1,2, J. F. J. van den Brand¹, T. de Forest, Jr.¹, J. W. A. den Herder¹, E. Jans¹, P. H. M. Keizer¹, L. Lapikás¹, P. J. Mulders¹, E. N. M. Quint¹, P. K. A. de Witt Huberts¹, J. Mougey^3,*, S. Boffi^4,5, C. Giusti^4,5, and F. D. Pacati^4,5

¹National Instituut voor Kernfysica en Hoge Energiefysica (NIKHEF-K), 1009 AJ Amsterdam, The Netherlands
²Natuurkundig Laboratorium, Vrije Universiteit, Amsterdam, The Netherlands
³Departement de Physique Nucléaire et Hautes Energies, Centre d'Etudes Nucléaires de Saclay, 91191 Gif-sur-Yvette Cédex, France
⁴Dipartimento di Fisica Nucleare e Teorica dell'Università, Pavia, Italy
⁵Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, Pavia, Italy