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Chin. Phys. B, 2017, Vol. 26(2): 023401    DOI: 10.1088/1674-1056/26/2/023401
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

Optical potential approach for positron scattering by metastable 23S state of helium

Xi-Gang Wu(吴锡刚)1, Yong-Jun Cheng(程勇军)2, Fang Liu(刘芳)3, Ya-Jun Zhou(周雅君)2
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
Abstract  

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.

Keywords:  positron      excited      helium      positronium formation  
Received:  26 September 2016      Revised:  31 October 2016      Published:  05 February 2017
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.))  
  34.80.Uv (Positron scattering)  
  34.80.Lx (Recombination, attachment, and positronium formation)  
Fund: 

Project supported by the Natural Science Foundation of Heilongjiang Province of China (Grant No. 12541160).

Corresponding Authors:  Yong-Jun Cheng     E-mail:  yongjun.cheng@hit.edu.cn

Cite this article: 

Xi-Gang Wu(吴锡刚), Yong-Jun Cheng(程勇军), Fang Liu(刘芳), Ya-Jun Zhou(周雅君) Optical potential approach for positron scattering by metastable 23S state of helium 2017 Chin. Phys. B 26 023401

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