High Resolution Quasi-Free (e,e′p) Experiments

  • P. K. A. de Witt Huberts
Part of the NATO ASI Series book series (NSSB, volume 142)


The purpose of these lectures is to provide an introduction to recent state-of-the-art developments in the field of the quasi-free proton-knock-out process induced by high-energy (=500 MeV) electrons. In the electron scattering (e,e′) response function d2σ/dΩde′ of a nucleus the quasi-free process becomes the dominant feature when the wavelength of the virtual photon becomes of the order of the nucleon dimension δ r=0.8 fm. Since the average internucleon distance amounts to = 2 fm and provided that the mean free path of the knocked-out nucleon is substantially larger than the internucleon distance, the dominant reaction mechanism involves incoherent scattering off individual (quasi-free) nucleons. In this incoherent scattering limit the probability distribution of momentum and energy of the struck nucleon can be reconstructed if a coincidence (e,e′p) experiment is performed. Due to the, in principle, straightforward simplicity of interpretation the quasi-free process has found widespread application in diverse fields varying from the few kilo electron volt (e,2e) process1 at the level of atomic dimensions, to the deep-inelastic scattering of multi-GeV electrons from point-like constituents (partons) in the nucleon.2


Spectral Function Momentum Distribution Optical Potential Virtual Photon Occupation Probability 
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Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • P. K. A. de Witt Huberts
    • 1
  1. 1.NIKHEF-KAJ AmsterdamThe Netherlands

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