Off-shell continuum distorted wave theory for positronium formation from noble gas atoms

Macri, P. A.; Barrachina, R. O.

doi:10.1016/j.nimb.2007.12.039

Cited by 4 publications

(2 citation statements)

References 33 publications

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“…This has motivated numerous studies of collisions in which electrons in atomic or molecular targets are captured by positrons [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. In a collision, each of the various modes into which the system under study may be fragmented is called a channel.…”

Section: Introductionmentioning

confidence: 99%

“…Both positrons (e + ) and positronium atoms (P s) have important applications in many different branches of physics, chemistry and other fields [1][2][3][4][5][6]. This has motivated numerous studies of collisions in which electrons in atomic or molecular targets are captured by positrons [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. In a collision, each of the various modes into which the system under study may be fragmented is called a channel.…”

Section: Introductionmentioning

confidence: 99%

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A Self-Consistent Model for Positronium Formation from Helium Atoms

Ghanbari-Adivi

2012

Braz J Phys

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The differential and total cross sections for electron capture by positrons from helium atoms are calculated using a first-order distorted wave theory satisfying the Coulomb boundary conditions. In this formalism a parametric potential is used to describe the electron screening in a consistent and realistic manner. The present procedure is self consistent because (i) it satisfies the correct boundary conditions and post-prior symmetry, and (ii) the potential and the electron binding energies appearing in the transition amplitude are consistent with the wave functions describing the collision system. The results are compared with the other theories and with the available experimental measurements. At the considered range of collision energies, the results agree reasonably well with recent experiments and theories.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Self-Consistent Model for Positronium Formation from Helium Atoms

Ghanbari-Adivi

2012

Braz J Phys

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Off-shell Distorted-Wave theory for positronium formation collisions

Macri

Barrachina

2009

Nuclear Instruments and Methods in Physics Research Section B:

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Two-center convergent close-coupling calculations for positron-lithium collisions

et al. 2010

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We report on two-center convergent close-coupling calculations of positron-lithium collisions. The target is treated as one active electron interacting with an inert ion core. The positronium formation channels are taken into account explicitly utilizing both negative-and positive-energy Laguerre-based states. A large number of channels and high partial waves are used to ensure the convergence of the cross sections. We find the Ramsauer-Townsend minimum in total and elastic cross sections at the impact energy E about 0.0016 eV. As found previously for H and He, the contribution to the break-up cross section from both the Li and Ps centers becomes the same as the threshold is approached.

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Off-shell continuum distorted wave theory for positronium formation from noble gas atoms

Cited by 4 publications

References 33 publications

A Self-Consistent Model for Positronium Formation from Helium Atoms

A Self-Consistent Model for Positronium Formation from Helium Atoms

Off-shell Distorted-Wave theory for positronium formation collisions

Two-center convergent close-coupling calculations for positron-lithium collisions

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