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Experiments were carried out to study the transmission of 3 -keV Ne 7 + ions through nanocapillaries in polyethylene terephthalate (PET). The capillaries were highly parallel with a diameter of 230 nm and a length of 12 μ m . The transmission during the charging and discharging processes was measured for different tilt angles ranging from 3 ∘ to 9 ∘ . An advanced instrumental technique was employed to avoid recharging effects during the discharging process. During discharging, the decay of the guided transmission is found to be non-exponential depending strongly on the tilt angle. The experiments were interpreted by model calculations using a minimum number of free parameters. The discharging results for different tilt angles are reproduced by a single decay function involving nonlinear properties. After measuring the discharge for nearly 7 hours, the charge depletion rate was found to be unexpectedly small resulting in a long duration of the charges in the capillary. [ABSTRACT FROM AUTHOR]

In this paper, the Atomki Accelerator Centre (AAC, Debrecen, Hungary) incorporating several small-sized particle accelerators is reviewed. The energy range of our accelerators for proton beam is between 50 eV and 20 MeV. The technical and personnel organization of AAC is presented together with the rules of beamtime requests and usage. Three of our accelerators (Cyclotron, ECRIS, Tandetron) are described in detail with their technical descriptions and with the main application fields. As an example for highlights, a series of unique low-energy ion–sample irradiations and post-treatments are shown which, by our hopes and plans, form a bridge between physics and biology. [ABSTRACT FROM AUTHOR]

An experiment to measure the strong interaction width (Γ1s) and shift (ℇ1s) of the ground state of pionic hydrogen (π-p), in order to determine the isospin separated scattering lengths (a+ and a-) with a relative accuracy of better than 10-2, has been undertaken at the Paul Scherrer Institute (PSI). This measurement is based on high-precision X-ray spectroscopy of the np→1s transitions pionic hydrogen (π-p). A preliminary analysis of the data taken in December 2000 is presented. [ABSTRACT FROM AUTHOR]