1 Academy of Physical Science and Technology and School of Applied Foreign Languages, Heilongjiang University, Harbin 150080, China;
2 Academy of Fundamental and Interdisciplinary Science, Harbin Institute of Technology, Harbin 150080, China;
3 Department of Material Physics, Harbin University of Science and Technology, Harbin 150080, China
The momentum space coupled channels optical (CCO) method for positron scattering has been extended to study the scattering of positrons by metastable helium for impact energies in the range from the positronium threshold up to high energies. Both the positronium formation and ionization continuum channels are included in the calculations via a complex equivalent local potential. The positronium formation, ionization, elastic and 23S-23P excitation, and total scattering cross sections are all presented and compared with the available information.
Received: 26 September 2016
Revised: 31 October 2016
Accepted manuscript online:
PACS:
34.10.+x
(General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.))
Kodysov A S and Bray Igor 2002 Phys. Rev. A 66 012710
[15]
Hanssen J, Hervieux P A, Fojon F A and Rivarola R D 2000 Phys. Rev. A 63 012705
[16]
Bartschat K 2002 J. Phys. B: At. Mol. Opt. Phys. 35 L527
[17]
Gribakin F and Ludlow J 2004 Phys. Rev. A 70 032720
[18]
Cheng Y and Zhou Y 2007 Phys. Rev. A 76 012704
[19]
McCarthy I E and Stelbovics A T 1980 Phys. Rev. A 22 502
[20]
McCarthy I E and Zhou Y 1994 Phys. Rev. A 49 4597
[21]
Cheshire I M 1964 Proc. Phys. Soc. 83 227
[22]
Mitroy J, Bromley M W J and Ryzhikh G G 2002 J. Phys. B: At. Mol. Opt. Phys. 35 R81
[23]
Dzuba Y A, Flanbaum V V, Gribakin G F and King W A 1996 J. Phys. B: At. Mol. Opt. Phys. 29 3151
[24]
Rienzi J D and Drachman R J 2006 Phys. Rev. A 73 012703
[25]
Wilson W G and Williams W L 1976 J. Phys. B: At. Mol. Phys. 9 423
[26]
Neynaber R H, Trujillo S M, Marino L Land Rothe E W 1964 Atomic Collision Processes: Proceedings of the Third International Conference on the Physics of Electronic and Atomic Collisions, July 22-26, 1963
[27]
Fursa D and Bray I 1997 J. Phys. B: At. Mol. Opt. Phys. 30 757
[28]
Wang Y C, Zhou Y, Cheng Y, Ratnavelu K and Ma J 2010 J. Phys. B: At. Mol. Opt. Phys. 43 045201
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
