Výsledky vyhledávání - "W. E. Meyerhof"

Positron - hydrogen scattering in the vicinity of the positronium formation threshold

Autor: J W Humberston, M S T Watts, W. E. Meyerhof, P. Van Reeth

Publikováno v: Journal of Physics B: Atomic, Molecular and Optical Physics. 30:2477-2493

An analysis is made of the behaviour of the elastic scattering and positronium formation cross sections for s-, p- and d-wave low-energy positron - hydrogen scattering in the vicinity of the positronium formation threshold. The accurate cross section

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::59e84d9204caaa9ce2660f8041d5d50f
https://doi.org/10.1088/0953-4075/30/10/020

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Threshold and channel-coupling effects in positron elastic scattering from noble gases

Autor: W. E. Meyerhof, G. Laricchia

Publikováno v: Journal of Physics B: Atomic, Molecular and Optical Physics. 30:2221-2238

We examine angular-distribution measurements of Kauppila et al and others of positrons elastically scattered from noble-gas targets at energies near the positronium (Ps) threshold. We use an R-matrix theory approach in which the R-matrix elements are

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::95a9f1c1d924554e5ec7e1f80ebb00e1
https://doi.org/10.1088/0953-4075/30/9/022

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Electron-electron interaction in the ionization ofO7+by He

Autor: C. Y. Chen, K. L. Wong, V. Mergel, W. Wu, B. Walch, J. P. Giese, R. Döautrner, V. Frohne, H. Schmidt-Böautcking, W. E. Meyerhof, M. L. A. Raphaelian, C. L. Cocke, E. C. Montenegro, Rami Ali

Publikováno v: Physical Review A. 55:2771-2777

Contributions of the electron-electron and electron-nucleus interactions to the ionization of O{sup 7+} by He are experimentally separated using recoil momentum spectroscopy. The electron-electron contribution is found to produce much smaller recoil

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0569cc2292410e7779a0d564870d468b
https://doi.org/10.1103/physreva.55.2771

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Ionic charge dependence of the internal conversion coefficient and nuclear lifetime of the first excited state in125Te

Autor: G. Bogaert, C. Grunberg, J. P. Thibaud, J.F. Chemin, A. Lefebvre, F. Attallah, W. E. Meyerhof, J. N. Scheurer, J. Kiener, M. Aiche, J. R. Grandin, P. Aguer

Publikováno v: Physical Review C
Physical Review C, 1997, 55, pp.1665-1675. ⟨10.1103/PhysRevC.55.1665⟩
Physical Review C, American Physical Society, 1997, 55, pp.1665-1675. ⟨10.1103/PhysRevC.55.1665⟩

We have studied the ionic charge state dependence of the nuclear lifetime of the 35.5-keV first excited state of {sup 125}Te. We found for the 47{sup +} and 48{sup +} ions, 400 and 670{percent} variations with respect to the neutral-atom half-life (1

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dede676a11f6ea8518e58ad36f9945ed
https://doi.org/10.1103/physrevc.55.1665

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Positron scattering on atoms and molecules near the positronium threshold

Autor: W. E. Meyerhof, M S T Watts, G. Laricchia, J W Humberston, J. Moxom

Publikováno v: Canadian Journal of Physics. 74:427-433

Effects found in the total and elastic-scattering cross sections of positrons on atoms and molecules near the positronium (Ps) formation threshold are examined on the basis of R-matrix theory. In the case of atomic targets, the energy, dependence of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c3d5aed099a2f2fc13023aa0932ee879
https://doi.org/10.1139/p96-061

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Charge State Blocking ofK-Shell Internal Conversion in125Te

Autor: J. Kiener, J. P. Grandin, M. Aiche, C. Grunberg, A. Lefebvre, W. E. Meyerhof, F. Attallah, J. F. Chemin, J. N. Scheurer, G. Bogaert, P. Aguer, J. P. Thibaud

Publikováno v: Physical Review Letters. 75:1715-1718

We have studied the atomic charge state dependence of the nuclear lifetime of the 35.5-keV first excited state of {sup 125}Te. For the 47{sup +} and 48{sup +} ions, 300% and 640% increases, respectively, of the half-life were found with respect to th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::11ef5f0ebbec634d411c1c659b8a0c57
https://doi.org/10.1103/physrevlett.75.1715

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Density effect in relativistic K-shell ionization

Autor: D. G. Jensen, D. Kawall, D. W. Spooner, S. E. Kuhn, W. E. Meyerhof, K. Ishii, Z. E. Meziani, J. J. Kuffner, E. C. Montenegro

Publikováno v: Zeitschrift f�r Physik D Atoms, Molecules and Clusters. 29:265-268

Using a grazing emission method, we have made measurements of 22.6-GeV electron impact ionization cross sections at the front and back faces of ∼ 70-µm thick Al and Cu foils. These give, respectively, the cross sections without and with a density

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c44ecf4500a38fabd521861252dad65f
https://doi.org/10.1007/bf01437845

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Near threshold effects in positron-atom (molecule) scattering

Autor: W. E. Meyerhof, Á Kövér, J. Moxom, M. Charlton, G. Laricchia

Publikováno v: Hyperfine Interactions. 89:209-218

The energy dependence of the total cross-sections for ionization by positron impact has been measured for He, Ne, Ar, CO2 and O2. The interplay between this and other scattering channels has been investigated. The data for He, Ne and Ar has been inte

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c7c10e7616d81130fde3f768f9c5d866
https://doi.org/10.1007/bf02064507

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Projectile Energy and Atomic Number Dependence of Electron Capture from Pair Production in Relativistic Heavy Ion Collisions

Autor: Ali Belkacem, B. Feinberg, R. Bossingham, W. E. Meyerhof, Harvey Gould

Publikováno v: Physical Review Letters. 73:2432-2435

We report the first measurement of the energy dependence of electron capture from electron-positron pair production in relativistic heavy ion collisions. For a ${\mathrm{La}}^{57+}$ beam incident on Au, Ag, and Cu targets at energies of 0.405, 0.956,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::35309e7502c8fd40ea6194ef407fb7a3
https://doi.org/10.1103/physrevlett.73.2432

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Threshold effects in positron scattering on noble gases

Autor: W. E. Meyerhof, G. Laricchia, J. Moxom, M. Charlton, A. Kovar

Publikováno v: Physical Review A. 50:3129-3133

The energy dependence of the positronium (Ps) formation cross section for positrons colliding with all the stable inert atoms is analyzed near threshold. Using R-matrix and threshold theories, the corresponding variations with energy of the elastic-s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8224cfd89198db2ba1a1f40f3dae8d64
https://doi.org/10.1103/physreva.50.3129

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