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The effect of positronium formation in positron—alkali-atom scattering

✍ Scribed by H. Ray; Sadhan K. Adhikari; A.S. Ghosh

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
552 KB
Volume
227
Category
Article
ISSN
0009-2614

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✦ Synopsis

We study e+-Na, e+-K, and e+-Rb scattering using the close coupling approach in the static and coupled static expansion schemes. We calculate partial wave elastic scattering phase shifts and total elastic and Ps formation cross sections up to an incident positron energy of 100 eV. The effect of the positronium formation channel on the elastic channel is found to be strong in all cases up to an incident positron energy of 10 eV. We also make an estimate of the total cross section which exhibits a minimum as a function of energy at low energies.

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A multichannel theory for the positron annihilation above the positronium formation threshold based on the modified Faddeev equation is presented. Its relation with the one channel effective charge formula is discussed. Application to the positron-hydrogen scattering has been carried out. A number o