Ionization cross sections of helium and hydrogenic ions by antiproton impact

Igarashi, Akinori; Nakazaki, Shinobu; Ohsaki, Akihiko

doi:10.1016/s0168-583x(03)01767-1

Cited by 15 publications

(22 citation statements)

References 15 publications

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“…In contrast to the case of p + H 2 a number of advanced calculations (e.g., [40][41][42]) were performed for p + He ionization cross sections in addition to the experiments. This allows for a rough estimate of some of the uncertainties of the present results stemming from the target model and the use of the IPM for the presented He stopping power as well as for an attempt to estimate an corrected value of S at low impact energies.…”

Section: P + Hementioning

confidence: 99%

Stopping power of antiprotons in H,H2, and He targets

Lühr

Sáenz

2009

Phys. Rev. A

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The stopping power of antiprotons in atomic and molecular hydrogen as well as helium was calculated in an impact-energy range from 1 keV to 6.4 MeV. In the case of H2 and He the targets were described with a single-active electron model centered on the target. The collision process was treated with the close-coupling formulation of the impact-parameter method. An extensive comparison of the present results with theoretical and experimental literature data was performed in order to evaluate which of the partly disagreeing theoretical and experimental data are most reliable. Furthermore, the size of the corrections to the first-order stopping number, the average energy transferred to the target electrons, and the relative importance of the excitation and the ionization process for the energy loss of the projectile was determined. Finally, the stopping power of the H, H2, and He targets were directly compared revealing specific similarities and differences of the three targets.

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Section: P + Hementioning

confidence: 99%

Stopping power of antiprotons in H,H2, and He targets

Lühr

Sáenz

2009

Phys. Rev. A

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“…al. [11] as well as the calculation by Lühr and Saenz [12] (which applies the same model as the calculation of Lühr and Saenz [3] discussed above) in Fig. 1 as representative of the cross section for atomic hydrogen.…”

mentioning

confidence: 92%

“…Experimental data and theoretical calculations of the cross section for single ionization by antiproton impact on atomic hydrogen, molecular hydrogen and helium as a function of the projectile laboratory velocity. For atomic hydrogen, we show as dashed-dotted black curves calculations by Lühr and Saenz [12] and by Igarashi et al (green dash-dot-dot) [11]. Also shown as a brown solid curve is the low-velocity calculation of the total cross section for ionization by Cohen [4].…”

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confidence: 95%

Target Structure Induced Suppression of the Ionization Cross Section for Very Low Energy Antiproton-Hydrogen Collisions

et al. 2010

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Low energy antiprotons have been used previously to give benchmark data for theories of atomic collisions. Here we present measurements of the cross section for single, nondissociative ionization of molecular hydrogen for impact of antiprotons with kinetic energies in the range 2-11 keV, i.e., in the velocity interval of 0.3-0.65 a.u. We find a cross section which is proportional to the projectile velocity, which is quite unlike the behavior of corresponding atomic cross sections, and which has never previously been observed experimentally.

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“…A remarkable progress in the understanding of interactions between antiprotons (p) and atoms has been achieved over the last decades. Although the number of antiproton collision experiments [1,2,3,4,5,6,7] is limited due to the required effort for the production of lowenergy p, a large amount of theoretical studies employing a variety of different methods have been performed focusing on hydrogen [8,9,10,11,12,13,14,15,16,17,18,19] and helium [20,21,22,23,24,25,26,27,28,29,30] targets but also other targets like alkali-metal [31] or argon [32] atoms have been considered. Among these are full quantum-mechanical treatments for H as [19] and fullycorrelated two-electron calculations for He, e.g., [20,21].…”

Section: Introductionmentioning

confidence: 99%

Collisions of antiprotons with hydrogen molecular ions

Lühr

Sáenz

2009

Phys. Rev. A

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Time-dependent close-coupling calculations of the ionization and excitation cross section for antiproton collisions with molecular hydrogen ions are performed in an impact-energy range from 0.5 keV to 10 MeV. The Born-Oppenheimer and Franck-Condon approximations as well as the impact parameter method are applied in order to describe the target molecule and the collision process. It is shown that three perpendicular orientations of the molecular axis with respect to the trajectory are sufficient to accurately reproduce the ionization cross section calculated by [Sakimoto, Phys. Rev. A 71, 062704 (2005)] reducing the numerical effort drastically. The independent-event model is employed to approximate the cross section for double ionization and H+ production in antiproton collisions with H2.Comment: 12 pages, 5 figures, 4 table

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Ionization cross sections of helium and hydrogenic ions by antiproton impact

Cited by 15 publications

References 15 publications

Stopping power of antiprotons in H,H2, and He targets

Stopping power of antiprotons in H,H2, and He targets

Target Structure Induced Suppression of the Ionization Cross Section for Very Low Energy Antiproton-Hydrogen Collisions

Collisions of antiprotons with hydrogen molecular ions

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