Wakes, Dynamic Screening

  • Y. Yamazaki
Part of the Nato ASI Series book series (NSSB, volume 271)


Two topics on “wake” phenomena are reported. The first one concerns the density fluctuation induced in solids by swift ions. For this purpose, the knock-on collision electrons (ve ~ 2vp) emitted at 0° from thin carbon foils under 4.5 MeV N 2 + impact were measured as a function of the orientation θ of the molecular axis of the projectile with respect to the beam axis. A marked decrease in the yield has been observed near θ ~ 25°, which is a critical angle where the density fluctuation of target valence electrons changes its feature from collective to single-particle-like. The second topic concerns a search for wake-riding electrons employing slow antiprotons as well as equivelocity protons. Electrons emitted at 0° have been measured for projectile energies from 500 keV to 750 keV. Although a deep dip is predicted at ve ~ vP for antiproton-gas collisions, the observed spectrum is rather smooth with indication of a bump at ~ 50 eV below the energy where the dip is anticipated. The energy and the relative intensity of the bump are found to be consistent with those predicted for electrons released from a wake-riding state.


Density Fluctuation Projectile Energy Carbon Foil Target Electron Momentum Spread 


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Copyright information

© Plenum Press, New York 1991

Authors and Affiliations

  • Y. Yamazaki
    • 1
  1. 1.Institute of Physics, College of Arts and SciencesUniversity of TokyoMeguro-ku, TokyoJapan 153

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