[en] Short note

[en] A particle-core coupling model is investigated, which is thought to describe low-lying odd-parity states in N=82 isotones or in tin isotopes. One nucleon in an outer shell is coupled to shell-model core states. A restriction to core states in the vicinity of the yrast line is shown to be a reasonable approximation, and thereby calculations of energies and electromagnetic properties become feasible for these odd-parity levels in semimagic nuclei. (author)

[en] The effective particle-hole interaction of Millener and Kurath which contains non-central components is used to study the non-normal parity states of A = 9 - 12 nuclei in the framework of all non-spurious 1(h/2π)ω excitations. Additional calculations with a pure central force confirm the conclusion that non-central forces are necessary for a unified description of non-normal parity states in 1p-shell nuclei. (author)

No abstract available

No abstract available

[en] The structure of x-ray continua observed recently in violent collisions between intermediate mass atoms can be explained by a superposition of K molecular orbital (KMO) radiation and of an intermediate L-K molecular orbital (ILKMO) radiation of high intensity which is due to 2psigma vacancies. (author)

[en] Yet in this year physicians and scientist can take into operation the new ion beam therapy facility (HIT) of the Heidelberg University clinicum. The Jaeger, Mornhinweg+Partner Ingenieurgesellschaft GmbH (JMP) concipitated for the accelerator facility the cooling loops and detector supply as well as the conventional civil-engineering facilities. Planning and construction were proved as an extremely difficult project with many unknowns. A comparable facility existed hitherto only in Japan

[en] The processes of deposition and structural relaxation of tetrahedral amorphous carbon (ta-C) films are investigated using atomistic computer simulations. Applying classical molecular dynamics with a modified hydrocarbon potential of Brenner, ion-beam deposition of carbon films was simulated for ion energies E=10-80 eV, and for substrate temperatures ranging from 100 to 900 K. The dependence of the sp³ content and intrinsic stress in the simulated films on substrate temperature was found to agree qualitatively with experiment. At low ion energies and low substrate temperatures, the sp³ fraction increases with ion energy, giving ∼80-85% of sp³ bonding at E>30 eV. Above 200 deg. C simulations with the Brenner potential predict a sharp transition from ta-C to graphitic carbon with dominating sp² bonding. Simulating thermal annealing, we show that low-temperature structural relaxation in ta-C is accompanied by a considerable stress reduction with only minor changes in the short-range order

[en] Deviations from the Lorentzian shape of the high-energetic atomic line tail observed in heavy ion collisions can be explained by perturbed initial conditions which are due to the vacancy production. The present calculation for the Ni + 39 MeV Ni system shows a good agreement with the experimental result of the Dubna group. (author)

[en] The formation of buried silicon dioxide or nitride layers by high-dose implantation (typically 10¹⁸ ions cm^-2) of energetic ions at elevated target temperatures is being extensively studied to produce silicon-on-insulator structures for device applications. The present paper reviews the different approaches to model these processes. The phenomenological models reported so far describe the modification of ion range profiles by target swelling, changing target composition, surface sputtering, and diffusion of unbonded implanted species. Reasonable oxygen or nitrogen depth profiles can be computed, but the electrically active microstructures in the synthesized layer systems are still beyond the scope of these simulations. (orig.)