Phys. Rev. Lett. 93, 042502 (2004) [4 pages]Stopping Power in Insulators and Metals without Charge ExchangeReceived 18 November 2003; published 21 July 2004 The slowing-down process of pointlike charged particles in matter has been investigated by measuring the stopping power for antiprotons in materials of qualitatively very different nature. Whereas the velocity-proportional stopping power observed for metal-like targets such as aluminum over a wide energy range of 1–50 keV is in agreement with expectations, it is surprising that the same velocity dependence is seen for a large band-gap insulator such as LiF. The validity of these observations is supported by several measurements with protons and several checks of the target properties. The observations call for both a qualitative explanation and a quantitative theoretical model. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.042502
DOI:
10.1103/PhysRevLett.93.042502
PACS:
29.30.Aj, 34.50.Bw, 61.85.+p
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