scholarly journals Hyperspherical close-coupling calculation of D-wave positronium formation and excitation cross sections in positron–hydrogen scattering

1996 ◽  
Vol 74 (7-8) ◽  
pp. 353-359 ◽  
Author(s):  
Yan Zhou ◽  
C. D. Lin
Keyword(s):  
Cross Sections ◽  
Atomic Hydrogen ◽  
Positronium Formation ◽  
Close Coupling ◽  
Inelastic Threshold ◽  
Excitation Cross Sections ◽  
Coupling Calculation ◽  
Positron Collisions ◽  
Potential Curves ◽  
D Wave

The hyperspherical close-coupling method is used to calculate the elastic, positronium-formation, and excitation cross sections for positron collisions with atomic hydrogen at energies below the H (n = 4) threshold for the J = 2 partial wave. The resonances below each inelastic threshold were also analyzed. The adiabatic hyperspherical potential curves are used to identify the nature of these resonances.

scholarly journals Large Basis Calculation of Positron?Hydrogen Scattering at Low Energies

1995 ◽  
Vol 48 (4) ◽  
pp. 645 ◽  
Author(s):  
Jim Mitroy
Keyword(s):  
Cross Sections ◽  
Reaction Cross ◽  
Positronium Formation ◽  
Total Reaction Cross Section ◽  
Close Coupling ◽  
Variational Calculations ◽  
Low Energies ◽  
Coupling Approach ◽  
Channel Space ◽  
Basis Calculation

Calculations of low energy positron-hydrogen scattering using the close coupling approach are reported at low energies. The channel space includes nine physical hydrogen and positronium states and in addition twelve hydrogen and positronium pseudo-states. For energies below the positronium formation threshold, phase shifts are reported for J = 0 to 6 and are believed to have an absolute accuracy of 0�0015 radian or better. Elastic scattering and positronium formation cross sections in the Ore gap for the J = 0 and J = 1 partial waves are essentially identical with previous variational calculations. Total elastic and positronium formation cross sections are reported at incident energies below the ionisation threshold. Cross sections for the excitation of the H(n=2), H(n=3) and Ps( n=2) levels are also reported over a restricted energy range, and the total reaction cross section has been computed and compared with experiment.

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