Zobrazeno 1 - 10
of 331
pro vyhledávání: '"E. A. G. Armour"'
Autor:
E. A. G. Armour
Publikováno v:
Materials Science Forum. 666:25-30
There is currently great interest in the very large values of the positron annihilation rate that have been observed in low-energy positron scattering by some molecules. The annihilation rate is proportional to , the effective number of electrons in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c690fb7bc5c45c4ea4aa1257142cd581
https://doi.org/10.4028/www.scientific.net/msf.666.25
https://doi.org/10.4028/www.scientific.net/msf.666.25
Publikováno v:
Computer Physics Communications. 180:2410-2423
We present a program used to calculate intricate three-particle integrals for variational calculations of solutions to the leptonic Schrodinger equation with two nuclear centres in which inter-leptonic distances (electron–electron and positron–el
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b351b9c8a885ae0a72acb8f70dc1ff82
https://doi.org/10.1016/j.cpc.2009.07.008
https://doi.org/10.1016/j.cpc.2009.07.008
Autor:
E. A. G. Armour
Publikováno v:
Few-Body Systems. 45:169-172
It is well known that the system made up of a fixed proton and antiproton and an electron (or a positron) has no bound states if the internuclear distance R < 0.639a0. In this paper, I consider the more complicated system in which the electron and th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::de01e531e5b3336f206b220c7e3eddad
https://doi.org/10.1007/s00601-009-0011-1
https://doi.org/10.1007/s00601-009-0011-1
Autor:
J.N. Cooper, E. A. G. Armour
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 266:452-457
We give a progress report on ongoing calculations of phase shifts for very low energy elastic scattering of positrons by molecular hydrogen, using the generalised Kohn variational method. Further, provisional calculations of Z eff for molecular hydro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8029ccff7b4c69f478fa31ab4d7158fb
https://doi.org/10.1016/j.nimb.2007.12.023
https://doi.org/10.1016/j.nimb.2007.12.023
Autor:
M.R. Gregory, E. A. G. Armour
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 266:374-378
We consider the low-energy scattering of antihydrogen ( H ¯ ) by the simplest molecule, H 2 . This preliminary treatment applies a generalisation of the Kohn variational method to the calculation of total elastic cross section at low energies. The s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3996a145dc34e6ec5548f9065ecc506b
https://doi.org/10.1016/j.nimb.2007.12.013
https://doi.org/10.1016/j.nimb.2007.12.013
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 266:363-368
In this paper, we describe calculations that we have carried out of cross sections for rearrangement processes in very low-energy helium + antihydrogen ( H ¯ ) scattering that result in He + p ¯ + Ps or He p ¯ + e + or α p ¯ + Ps - . A significa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6794509fcd6e0cb3aa26f90df51fe666
https://doi.org/10.1016/j.nimb.2007.12.012
https://doi.org/10.1016/j.nimb.2007.12.012
Autor:
E. A. G. Armour, Svante Jonsell
Publikováno v:
Journal of Physics A: Mathematical and Theoretical. 40:701-710
We examine a method used by Zygelman B et al (2004 Phys. Rev. A 69 042715) to evaluate the transition matrix for rearrangement in atom–antihydrogen scattering. We make a small change to the expression used previously and generalize it to all kinds
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5206882d4db16b9a5e1645fbd35b01f7
https://doi.org/10.1088/1751-8113/40/4/008
https://doi.org/10.1088/1751-8113/40/4/008
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 247:127-132
We review theoretical results for low-energy scattering of antihydrogen and atomic hydrogen and helium. Various inelastic channels, such as rearrangement and annihilation, as well as elastic scattering, are considered. In particular we give a progres
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2f0d036332d3bfbc6e16d76d8ce31562
https://doi.org/10.1016/j.nimb.2006.01.049
https://doi.org/10.1016/j.nimb.2006.01.049
Autor:
A.C. Todd, E. A. G. Armour
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 247:143-146
In this paper, we present a summary of our work in progress on calculating cross sections for the He + H ¯ → He p ¯ + e + rearrangement process in He H ¯ scattering. This has involved a study of the system He p ¯ within the Born–Oppenheimer (
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f0cd21864593e47fdb7a3deb2b74789e
https://doi.org/10.1016/j.nimb.2006.01.051
https://doi.org/10.1016/j.nimb.2006.01.051
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 247:123-126
The aim of experimentalists currently working on the preparation of antihydrogen is to trap it at very low temperatures so that its properties can be studied. Of concern to experimentalists are processes that lead to a loss of antihydrogen through an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a830876b78ae69bfed3d63500a707b8a
https://doi.org/10.1016/j.nimb.2006.01.048
https://doi.org/10.1016/j.nimb.2006.01.048