Asymptotic cross section and scaling law: positronium formation in Rydberg states in positron–hydrogen collisions

Rej, Pramit; Ghoshal, Arijit

doi:10.1007/s12648-015-0811-8

Cited by 3 publications

(1 citation statement)

References 48 publications

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“…However, at higher energies, as is observed from table 3 and figure 3, the cross section values for the s-state dominate over all other states. It should be mentioned here that for the unscreened case it is found that the cross sections for electron capture into different angular momentum states are scaled according to then 3 scaling law [48,49,63,71,72]. Here we note that the influence of the background plasma on the variation of cross section with energy is significant.…”

Section: Resultsmentioning

confidence: 54%

Excited-state positronium formation in positron–hydrogen collisions under weakly coupled plasmas

Rej

Ghoshal

2016

J. Phys. B: At. Mol. Opt. Phys.

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The effect of screening of weakly coupled plasma on positronium (Ps) formation in excited states in the scattering of a positron from the ground state of a hydrogen atom has been investigated using a distorted wave theory which includes screened dipole polarization potential. The effect of external plasma has been incorporated by using the Debye–Hückel screening model of the interacting charge particles. Variationally determined simple hydrogenic wave functions have been used to obtain the distorted wave scattering amplitude in a closed form. Effects of plasma screening on the differential and total cross sections have been studied in detail in the energy range 20–300 eV of incident positron. For the free atomic case, our results agree nicely with some of the most accurate results available in the literature. To the best of our knowledge, such a study on the differential and total cross sections for Ps formation in highly excited states in positron–hydrogen collisions under weakly coupled plasma is reported first time in the literature.

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Section: Resultsmentioning

confidence: 54%

Excited-state positronium formation in positron–hydrogen collisions under weakly coupled plasmas

Rej

Ghoshal

2016

J. Phys. B: At. Mol. Opt. Phys.

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Scaling law for asymptotic cross section: Electron-hydrogen collisions

Nayek

Ghoshal

2016

Chinese Journal of Physics

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Positron scattering from hydrogen atom in dense quantum plasmas: Positronium formation in Rydberg states

Rej

Ghoshal

2017

Physics of Plasmas

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Effects of dense quantum plasmas on positronium (Ps) formation in an arbitrary nlm–state in the scattering of positrons from the ground state of hydrogen atoms have been investigated within the framework of a distorted wave theory that incorporates the effect of screened dipole polarization potential. The interaction of charged particles in plasmas has been modeled by a modified Debye-Huckel potential. Effects of plasma screening on the structures of differential and total cross sections have been explored for various incident positron energies in the range 20–300 eV. For the free atomic case, our results are in conformity with the existing results available in the literature. It has been found that for small screening effects, the cross section presents the oscillatory behaviour. To the best of our knowledge, this is the first attempt to estimate the screening effects on the differential and total cross sections for Ps formation in Rydberg states in dense quantum plasmas.

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Asymptotic cross section and scaling law: positronium formation in Rydberg states in positron–hydrogen collisions

Cited by 3 publications

References 48 publications

Excited-state positronium formation in positron–hydrogen collisions under weakly coupled plasmas

Excited-state positronium formation in positron–hydrogen collisions under weakly coupled plasmas

Scaling law for asymptotic cross section: Electron-hydrogen collisions

Positron scattering from hydrogen atom in dense quantum plasmas: Positronium formation in Rydberg states

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