scholarly journals Measurements of the total cross sections for positron scattering from He using an electrostatic high-brightness slow positron beam apparatus

2011 ◽  
Vol 262 ◽  
pp. 012042 ◽  
Author(s):  
Kazuaki Nagumo ◽  
Yuna Nitta ◽  
Masamitsu Hoshino ◽  
Hiroshi Tanaka ◽  
Yasuyuki Nagashima
Keyword(s):  
Cross Sections ◽  
Positron Beam ◽  
Positron Scattering ◽  
High Brightness ◽  
Slow Positron ◽  
Total Cross Sections

scholarly journals Measurements of the total cross sections for positron-He scattering using an electrostatic high-brightness slow positron beam apparatus

2009 ◽  
Vol 194 (7) ◽  
pp. 072007
Author(s):  
Kazuaki Nagumo ◽  
Daiki Tomida ◽  
Yuna Nitta ◽  
Masamitsu Hoshino ◽  
Hiroshi Tanaka ◽  
...  
Keyword(s):  
Cross Sections ◽  
Positron Beam ◽  
High Brightness ◽  
Slow Positron ◽  
Total Cross Sections

scholarly journals Close Coupling Theory of Positron Scattering from Alkali Atoms

1994 ◽  
Vol 47 (6) ◽  
pp. 721 ◽  
Author(s):  
Jim Mitroy ◽  
Kurunathan Ratnavelu
Keyword(s):  
Cross Sections ◽  
Alkali Atom ◽  
Coupling Theory ◽  
Positron Scattering ◽  
Close Coupling ◽  
Total Cross Sections ◽  
Hartree Fock ◽  
Atom Scattering ◽  
Alkali Atoms ◽  
Rearrangement Process

The close coupling equatious for positron-alkali atom scattering are written as a set of coupled momentum-space Lippmann-Schwinger equations. The alkali atom is represented by a frozen-core model based upon the Hartree-Fock approximation. The interaction between the positronium and the residual ion is modified by the inclusion of a core potential. Similarly, a core term is present in the interaction describing the rearrangement process. Close coupling calculations of positron scattering from sodium are performed in a model containing multiple sodium (3s, 3p, 4s, 3d, 4p) and positronium (Is, 2s, 2p) states. Cross sections are reported for an energy range from threshold to 50�eV; the total cross sections are in agreement with experimental data.

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