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Hans Henrik Andersen
 
 
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Hans Henrik Andersen (* 1937 Frederiksberg, Denmark) is Professor at the Niels Bohr Institute of the University of Copenhagen (emeritus
Emeritus

Emeritus is an adjective that is used in the title of a retired professor, bishop or other professional. Emerita was used for women, but is rarely used today....
 since 2004). He is co-editor of the scientific journal "Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms".

He has made important contributions to various fields of atomic physics
Atomic physics

Atomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nuclei. It is primarily concerned with the Electron configuration and...
 and solid state physics, especially in the field of the stopping power
Stopping power (particle radiation)

In passing through matter, fast charged particles ionization the atoms or molecules which they encounter. Thus, the fast particles gradually lose energy in many small steps....
 of matter for fast charged particles.






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Hans Henrik Andersen (* 1937 Frederiksberg, Denmark) is Professor at the Niels Bohr Institute of the University of Copenhagen (emeritus
Emeritus

Emeritus is an adjective that is used in the title of a retired professor, bishop or other professional. Emerita was used for women, but is rarely used today....
 since 2004). He is co-editor of the scientific journal "Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms".

He has made important contributions to various fields of atomic physics
Atomic physics

Atomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nuclei. It is primarily concerned with the Electron configuration and...
 and solid state physics, especially in the field of the stopping power
Stopping power (particle radiation)

In passing through matter, fast charged particles ionization the atoms or molecules which they encounter. Thus, the fast particles gradually lose energy in many small steps....
 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 particle
Alpha particle

Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium atomic nucleus; hence, it can be written as He2+ or 42He2+....
s is more than four times as large as that for proton
Proton

The proton is a subatomic particle with an electric charge of +1 elementary charge. It is found in the nucleus of each atom but is also stable by itself and has a second identity as the hydrogen ion, H+....
s. Since the atomic number
Atomic number

In chemistry and physics, the atomic number is the number of protons found in the atomic nucleus of an atom. It is conventionally represented by the symbol Z....
  of alpha particles is exactly twice as big as that of protons, that means that the stopping power is not exactly proportional to , as the simple Bethe formula
Bethe formula

The Bethe formula describes the energy loss per distance travelled of swift charged particles traversing matter . The theory of relativity version was found by Hans Bethe in 1930; the relativistic version was found by him in 1932 ....
 would have it. That was an additional proof of the existence of the Barkas
Walter H. Barkas

Walter H. Barkas was Professor of Physics at the University of California, Riverside from 1965 on. He specialized in the use of nuclear emulsions, i.e., Photographic plate having a thick sensitive layer, for purposes of Particle physics....
-Effect.

Literature


  • Andersen H.H., Simonsen H., Sørensen H.: "An experimental investigation of charge-dependent deviations from the Bethe stopping power formula", Nuclear Physics A125 (1969) 171


  • Sigmund P.: "Particle Penetration and Radiation Effects, General Aspects and Stopping of Swift Point Charges", Springer Series in Solid State Sciences Vol. 151, Springer-Verlag Berlin Heidelberg (2006)