[en] Complete text of publication follows. We have found experimental signatures (peaks, structures in the electron spectra) of consecutive projectile-target-projectile-target-etc. scattering of the emitted electrons before ejection at atomic targets. This type of multiple scattering is often referred as Fermi shuttle mechanism, the electrons are sometimes called Ping-Pong electrons. The experiment has been performed at the beamline of the 5 MV electrostatic accelerator in ATOMKI in 150 and 233 keV/u collisions of singly charged He, C and O ions and inert gas (He, Ne, Xe) targets. The ejected electron shave been measured by the ESA-21 electrostatic electron spectrometer in the 10-3000 eV energy region, in 13 angular channels simultaneously (including at 0 and 180 degrees). For C and O ions, the data provide evidence of double scattering at backward angles (at 2 V_p). Moreover, for C+Xe and O+Xe collisions, we found a clear signature of triple scattering at forward angles (4 V_p) in the spectra of the emitted electrons. A small but significant structure at backward angles which might be associated with quadrupole scattering has also been found at 4 V_p. In the studied collision systems, the significant disagreement between theory and experiment at high electron energies seem to be dominantly due to the structures belonging to multiple scattering processes. Consequently, for high energy ejected electrons, one might associate the main process beyond first order in the intermediate impact velocity region with consecutive (P-T-P-...) multiple scattering. (author)

[en] Complete text of publication follows. Double differential electron spectra emitted from He and Ne target atoms by fast heavy-ion impact were measured, extending the systematic study of the ionization of inert-gas targets to higher impact energies range. Helium and neon atoms were bombarded by 95 MeV/u Ar¹⁸⁺ ions and the double differential cross sections for electron emission have been determined. The measured angular distribution patterns exhibit significant differences between the two target species. Good agreement has been found between experiment and CDW-EIS theory for the helium target, while for neon experiment provides an angular distribution that differs from the theoretical prediction both in shape and magnitude at low electron energies. Since we found that theoretical neon data are rather sensitive to the wave functions, one might associate this finding with an inappropriate description of the atomic structure. (author)

[en] Complete text of publication follows. The proton excited carbon and oxygen K-LL Auger spectra of carbon dioxide were measured using the high-resolution, angular resolving ESA-21 electron spectrometer. The 1.0 MeV proton impact energy was provided by the 5 MV van der Graaff accelerator of ATOMKI. The transition energies of both K-LL Auger-spectra (oxygen and carbon) are determined and compared with the existing theoretical and earlier experimental data. The energy positions, line widths (FWHM) and relative intensities of the Auger lines were determined by the experiment. Satellite transitions are apparent in both Auger spectra. Some peaks in the spectra have contributions from configuration interactions, double Auger, shake-up and shake-off Auger satellites. Most probably, the assumed linear background does not include all satellite contributions of the spectra. By using synchrotron radiation, it is possible to ionize atoms and molecules selectively in order to produce a clean Auger spectrum. By comparing such a spectrum with an Auger spectrum produced by particle impact it is possible to identify satellite Auger structures. For the further study of the carbon and oxygen K-LL Auger spectra of CO₂, synchrotron radiation excited measurements with photon energies just above the ionization potential of carbon and oxygen 1s shell are needed. This work is continuation of the angular distribution investigation of the Auger electron spectra made in ATOMKI. One of the previous measurements was made with a diatomic homonuclear molecule (N₂) [1], where noticeable angular distribution was found for few transitions only. For triatomic, heteronuclear molecule (CO₂), the possible anisotropy of the angular distribution of the Auger emission was also studied, and the Auger lines in both spectra (C and O) were found to be isotropic within the experimental accuracy [2]. (author)

[en] Complete text of publication follows. The operation of the cyclotron in 1999 was concentrated to the usual 9 months; January, July and August were reserved for maintenance and holidays. The overall working time of the accelerator was 4265 hours, the breakdown periods amounted to 76 hours last year. The cyclotron was available for users during 3888 hours, the effectively used beam time is summarized in Table 1. (FERMI: Front-End Readout Microsystems, Radiation hardness measurements, CERN RD-16). The time used for machine setup and beam tuning or waiting for the start of an irradiation totalled to 546 hours. The modernization of the vacuum and control systems of the cyclotron - within the framework of a Technical Assistance Program (HUN/4/013) of the International Atomic Energy Agency - has been carried on. The renewal of the gas supply system was completed in the winter maintenance period. It included the replacement of the manual valves with high pressure solenoid valves and the installation of a Tylan FC-280A mass flow controller to set and change the amount of gas flow into the ion source. All the new elements have been connected to the PLC-station dedicated to the control of the vacuum subsystems. The control code, which provides automated has change processes and allows for very precise regulation of the gas inlet, has been developed as well. As a result, the time to change the working gas in the ion source has been significantly decreased (by a factor of 5 to 10) - the process is completely automated now and does not require any manual or local control from the operator. (author)

[en] Short communication

[en] Short communication

[en] Short communication

[en] Short communication

[en] Short communication

[en] Short communication