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ERD, 15N external beam for NRRA in air, HIRBS: ion beam analysis developments on the HVEC EN-1 Tandem

Autor: P. Wei, Sjoerd Roorda, R. Kolarova, J.S. Forster, François Schiettekatte, Martin Chicoine, S. C. Gujrathi, J.S. Geiger, A. Paradis

Publikováno v: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. :430-434

In the last year, EN-1, the first HVEC Tandem accelerator, has gone through a major upgrade in which the injector, charging system and tubes were replaced. In addition, the ion beam analysis facilities have been upgraded and expanded. The gas-counter

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ebfd0c11689641bb5ba4eeb74ea565ed
https://doi.org/10.1016/j.nimb.2004.01.096

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Channeling of 7.6 MeV He in YBCO

Autor: G.C. Ball, J.S. Forster, R.P. Sharma, Jens Ulrik Andersen, J.S. Geiger, J.A. Davies, A. Uguzzoni

Publikováno v: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 135:56-60

Channeling dips for 7.6 MeV He ions in YBa 2 Cu 3 O 7− x have been measured for all constituents to investigate possible anomalies in thermal vibrations near the transition to superconductivity. Quantitative agreement with simulations is obtained f

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d75206dffc0ea14e59cd0898c0296de6
https://doi.org/10.1016/s0168-583x(97)00562-4

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Use of the 7.6 MeV 16O(α, α) resonance in studying the anomalous channeling behaviour of YBa2Cu3O7 − x near Tc

Autor: J.S. Forster, Jens Ulrik Andersen, A. Uguzzoni, R. Haakenaasen, L. E. Rehn, R.P. Sharma, N.E. Hecker, J.S. Geiger, J.A. Davies, G.C. Ball

Publikováno v: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 118:190-195

By using the intense 16 O( 4 He, 4 He) elastic scattering resonance at 7.3–7.6 MeV, we have been able to extend the earlier investigations [1–4] of the channeling behaviour in YBa 2 Cu 3 O 7 − x around T c to include the backscattering signal f

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c3281eb415fca09ffdbe9898602b27b4
https://doi.org/10.1016/0168-583x(96)00243-1

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Dielectronic recombination and energy loss for He-likeBr79ions channeled in a thin single crystal of Si

Autor: Elliot P. Kanter, J.S. Geiger, G.C. Ball, J.S. Forster, W.G. Davies, Jacques Chevallier, H. Geissel, Jens Ulrik Andersen, John A. Davies

Publikováno v: Physical Review A. 54:624-635

Dielectronic recombination of He-like {sup 79}Br ions channeled along the {l_angle}110{r_angle} axis of a thin Si crystal has been studied by the measurement of the charge-state distribution and x-ray production. The results of the charge-state measu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::39d2598fe9c3929767e9b974fe4223cc
https://doi.org/10.1103/physreva.54.624

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Resonant coherent excitation (RCE) of higher-order resonances for 28Si13+ ions channeled in a thin Si crystal

Autor: W.G. Davies, H. Geissel, John A. Davies, J.S. Forster, F. Nickel, J.S. Geiger, Jens Ulrik Andersen, G.C. Ball

Publikováno v: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 107:27-30

Resonant coherent excitation of hydrogen-like 28Si13+ ions, channeled in a thin Si crystal, has been observed for Δn = 1, 2 and 3 transitions (K-shell to L-, M- and N-shells, respectively). In addition, selection of ions which come close to the stri

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f8da1b27abc2b11e5ad244403e5574c6
https://doi.org/10.1016/0168-583x(95)01029-7

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Resonant coherent excitation of N6+ and Mg11+ in planar channeling: anisotropies in ionization probabilities and X-ray emission

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

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::74061ff68fe0c996a87889fc24da9c74
https://doi.org/10.1016/0168-583x(94)00838-8

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Energy loss of heavy ions at high velocity

Autor: Jens Ulrik Andersen, V.A. Ryabov, H. Geissel, J.S. Forster, G.C. Ball, W.G. Davies, John A. Davies, J.S. Geiger

Publikováno v: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 90:104-111

The slowing down of heavy ions by electronic stopping at high velocity is discussed. The ions are nearly fully stripped and have a well defined charge with relatively small fluctuations. Owing to the large charge of the ions, the classical Bohr formu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4e5a61a4e32e296e89f25bcb3502afb9
https://doi.org/10.1016/0168-583x(94)95523-9

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Resonant transfer and excitation (RTE) in He-like 79Br ions channeled along the 〈110〉 direction in Si

Autor: E. P. Kanter, Jens Ulrik Andersen, W.G. Davies, T.K. Alexander, J.S. Geiger, G.C. Ball, John A. Davies, H. Geissel, J.S. Forster

Publikováno v: Radiation Effects and Defects in Solids. 126:299-302

(1993). Resonant transfer and excitation (RTE) in He-like 79Br ions channeled along the 〈110〉 direction in Si. Radiation Effects and Defects in Solids: Vol. 126, No. 1-4, pp. 299-302.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d8c253a2705be1c10c2c31e02bd8eebf
https://doi.org/10.1080/10420159308219730

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Dielectronic recombination forBr33+ions channeled in an Au crystal

Autor: Jacques Chevallier, W.G. Davies, J. S. Forster, Jens Ulrik Andersen, H. Geissel, J.S. Geiger, G. C. Ball, John A. Davies

Publikováno v: Physical Review Letters. 70:750-753

Dielectronic recombination for Br 33+ has been measured for channeling along a axis in Au. In contrast to the recent surprising observation by Belkacem et al., both the resonance width and strength are in agreement with the predicted values for an el

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::42b77eae6b14a19a0f6df637d9bf8e0b
https://doi.org/10.1103/physrevlett.70.750

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