Zobrazeno 1 - 10
of 66
pro vyhledávání: '"Peter F. Dittner"'
Autor:
R. Schuch, H. Gao, Peter F. Dittner, E.F. Deveney, Sheldon Datz, H.F. Krause, Roger Hutton, C. R. Vane
Publikováno v:
Physical Review A. 56:3682-3686
Free positrons from electron-positron pairs produced by 33-TeV Pb{sup 82+} ions in Coulomb collisions with targets of carbon [(CH){sub x}], aluminum, palladium, and gold have been measured to determine cross sections and momentum distributions. Upper
Autor:
Helge Knudsen, Sheldon Datz, H. Gao, E.F. Deveney, C. R. Vane, H.F. Krause, R. Schuch, P. Grafström, Roger Hutton, Peter F. Dittner
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 124:169-176
We have used beams of 6.4 TeV S ions and 33.2 TeV Pb ions obtained from the CERN-SPS facility to study collision processes of heavy ions at ultrarelativistic energies. Measurements have been made of electron-positron pair production, and capture of a
Autor:
H.F. Krause, Roger Hutton, Sheldon Datz, E.F. Deveney, H. Gao, P. Grafström, Helge Knudsen, C. R. Vane, R. Schuch, Peter F. Dittner
Publikováno v:
Physica Scripta. :167-171
Recent availability of relativistic and ultrarelativistic beams of heavy ions has permitted the first controlled studies of atomic collisions at energies sufficient to measure effects of several new basic phenomena. These include measurements substan
Autor:
P. Hvelplund, Peter F. Dittner, P.D. Miller, Oakley H. Crawford, J. Gomez del Campo, Sheldon Datz, J. A. Biggerstaff, H. Knudsen, C. D. Moak, H.F. Krause
Publikováno v:
Physical Review Letters. 76:1856-1859
A first-principles calculation of the resonant-coherent excitation of planar-channeled hydrogenic ions is presented. The interplay between coherent interaction with the periodic crystal lattice potential and inelastic electron-electron collisions is
Autor:
W.G. Davies, C. R. Vane, J.S. Forster, H.F. Krause, Sheldon Datz, Oakley H. Crawford, G.S. Ball, J.S. Geiger, Peter F. Dittner
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 100:272-278
Hydrogenic ions penetrating a crystal are perturbed by the frequency with which they pass atoms lying in rows or ordered planes. This frequency, when resonant, can cause excitation of the ion with subsequent collisional ionization or radiative relaxa
Autor:
Harald Schone, P.D. Miller, Sheldon Datz, Michael Schulz, R. Schuch, Peter F. Dittner, J. P. Giese, H.F. Krause, Quentin C. Kessel, C. R. Vane
Publikováno v:
Physical Review A. 51:324-336
The projectile energy loss for 7.5--25-MeV C[sup 6+,5+] and F[sup 6+] ions was measured for single collisions with He, Ne, Ar, and Kr as a function of the recoil-ion charge state and the projectile scattering. This energy loss was measured for collis
Publikováno v:
Physical Review Letters. 71:348-351
We have observed selection rules for the resonant excitation of swift hydrogenlike ions ([ital Z]=6,7) axially channeled in the [l angle]111[r angle] direction of a diamond lattice (silicon). The resonant excitation arises from a coherent periodic pe
Autor:
N.L. Jones, Peter F. Dittner
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 328:191-194
An improved voltage gradient control system has been designed and installed in the EN tandem at the Oak Ridge National Laboratory. An improved design was sought due to high failure rates, increasing replacement parts and labor costs, and decreasing a
Autor:
C. Bottcher, Peter F. Dittner, C. R. Vane, H.F. Krause, H. Gao, Sheldon Datz, Roger Hutton, M. R. Strayer, Reinhold Schuch
Publikováno v:
Physical Review Letters. 69:1911-1914
Angular and momentum distributions have been measured for positrons from electron-positron pairs created in peripheral collisions of 6.4-TeV sulfur ions with fixed targets of Al, Pd, and Au. The data are compared with results of several theoretical t
Autor:
Peter F. Dittner, N. L. Jones, H.F. Krause, Sheldon Datz, C. R. Vane, U. Bechthold, J. Gomez del Campo, P. A. Zeijlmans van Emmichoven
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 67:256-261
X-rays generated by fully stripped titanium ions channeled along the 〈100〉 axis of a thin gold single crystal have been measured in coincidence with charge-changed ions as a function of ion energy loss. X-rays from the process of radiative electr