Hans Henrik Andersen
Hans Henrik Andersen (May 1, 1937 in
Nuclear Instruments and Methods in Physics Research B
".
He has made important contributions to various fields of
solid state physics, especially in the field of the stopping power
of matter for fast charged particles. The accuracy (0.3–0.5%) of his measurements is unsurpassed even today (2006). They were done by measuring the amount of heat deposited in a foil at the temperature of liquid helium (−269 °C).
Together with his collaborators, he succeeded in showing in 1969 that the stopping power for fast alpha particles is more than four times as large as that for protons. Since the atomic number (Z) of alpha particles is exactly twice as big as that of protons, that means that the stopping power is not exactly proportional to Z2, as the simple Bethe formula would have it. That was an additional proof of the existence of the Barkas effect.
Literature
- Andersen, H.H.; Simonsen, H.; Sørensen, H. (1969). "An experimental investigation of charge-dependent deviations from the Bethe stopping power formula". .
- Sigmund, P. (2006). Particle Penetration and Radiation Effects. Springer Series in Solid State Sciences. Vol. 151. ISBN 978-3-540-72622-7.
References
- ^ Sigmund, Peter (2012). "Hans Henrik Andersen". Physics Today. Archived from the original on 16 June 2013. Retrieved 12 December 2012.
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