Ulrik I. Uggerhøj

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[1] We have studied sulfuric acid aerosol nucleation in an atmospheric pressure reaction chamber using a 580 MeV electron beam to ionize the volume of the reaction chamber. We find a clear contribution from ion‐induced nucleation and consider this to be the first unambiguous observation of the ion‐effect on aerosol nucleation using a particle beam under(More)
BACKGROUND AND PURPOSE Antiprotons travel through tissue in a manner similar to that for protons until they reach the end of their range where they annihilate and deposit additional energy. This makes them potentially interesting for radiotherapy. The aim of this study was to conduct the first ever measurements of the biological effectiveness of(More)
A new scheme of making crystalline undulators was recently proposed and investigated theoretically by Andriy Kostyuk, concluding that a new type of crystalline undulator would be not only viable, but better than the previous scheme. This article describes the first experimental measurement of such a crystalline undulator, produced by using(More)
C. Scheidenberger, I. A. Pshenichnov, K. Sümmerer, A. Ventura, J. P. Bondorf, A. S. Botvina, I. N. Mishustin, D. Boutin, S. Datz,* H. Geissel, P. Grafström, H. Knudsen, H. F. Krause, B. Lommel, S. P. Møller, G. Münzenberg, R. H. Schuch, E. Uggerhøj, U. Uggerhøj, C. R. Vane, Z. Z. Vilakazi, and H. Weick GSI, Planckstraße 1, D-64291 Darmstadt, Germany Niels(More)
The total cross sections for single ionization of helium and single and double ionization of argon by antiproton impact have been measured in the kinetic energy range from 3 to 25 keV using a new technique for the creation of intense slow antiproton beams. The new data provide benchmark results for the development of advanced descriptions of atomic(More)
At very high energies the Earth magnetic field, although in many other connections considered rather weak, acts as a strong field on photons and leptons. This paper discusses the intimate connection between this effect and the corresponding ‘strong field effects’ observed at accessible accelerator energies in aligned single crystals. As such, these effects(More)
The stopping power for antiprotons in various solid targets has been measured in the low-energy range of 1-100 keV. In agreement with most models, in particular free-electron gas models, the stopping power is found to be proportional to the projectile velocity below the stopping-power maximum. Although a stopping power proportional to velocity has also been(More)
The Compact Linear Collider (CLIC) is an option for a future [Formula: see text] collider operating at centre-of-mass energies up to [Formula: see text], providing sensitivity to a wide range of new physics phenomena and precision physics measurements at the energy frontier. This paper is the first comprehensive presentation of the Higgs physics reach of(More)
Experimental results for the radiative energy loss of 149, 207, and 287 GeV electrons in a thin Ir target are presented. From the data we conclude that at high energies the radiation length increases in accordance with the Landau-Pomeranchuk-Migdal (LPM) theory and thus electrons become more penetrating the higher the energy. The increase of the radiation(More)