Ionization of Helium and Argon by Very Slow Antiproton Impact

Knudsen, H.; Kristiansen, Helle; Thomsen, Heine; Uggerhøj, U. I.; Ichioka, T.; Møller, S.P.; Hunniford, Christopher; McCullough, Robert; Charlton, M.; Kuroda, N.; Nagata, Y.; Torii, H. A.; Yamazaki, Y.; Imao, H.; Andersen, H. H.; Tőkési, K.

doi:10.1103/physrevlett.101.043201

Cited by 67 publications

(97 citation statements)

References 36 publications

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“…However, in the case ofp + He experiment and theory did not agree for impact velocities below the mean electron velocity of the ground state for more than a decade stimulating a vivid theoretical activity. The discrepancy has been partly resolved by very recent measurements onp + He by Knudsen et al [3].…”

Section: Introductionmentioning

confidence: 78%

Interaction of antiprotons with Rb atoms and a comparison of antiproton stopping powers of the atoms H, Li, Na, K, and Rb

2009

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Ionization and excitation cross sections as well as electron-energy spectra and stopping powers of the alkali metal atoms Li, Na, K, and Rb colliding with antiprotons were calculated using a time-dependent channel-coupling approach. An impactenergy range from 0.25 to 4000 keV was considered. The target atoms are treated as effective one-electron systems using a model potential. The results are compared with calculated cross sections for antiproton-hydrogen atom collisions.

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Section: Introductionmentioning

confidence: 78%

Interaction of antiprotons with Rb atoms and a comparison of antiproton stopping powers of the atoms H, Li, Na, K, and Rb

2009

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“…Forp + He collisions also the ionization cross section σ ion is experimentally and especially theoretically well studied (cf. [1] and references therein) making it a good candidate for the comparison of different approaches.…”

Section: Cp + Hementioning

confidence: 99%

“…A number of theoretical efforts have been done, e.g., for low-energy collisions with He atoms focusing on the single and double ionization cross sections. They were stimulated by discrepancies between experiment and theory lasting for more than a decade which only recently could partly be resolved [1]. In the case of ionization and excitation of the simplest two-electron molecule H 2 byp impact the rather sparse information [2,3] could be extended recently [4].…”

Section: Introductionmentioning

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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“…A large amount of theoretical work has been done for antiproton (p) collisions with He atoms stimulated by discrepancies between experiment and theory lasting for more than a decade [7]. In the case of hydrogen also a number of contributions exist for atomic targets whereas the knowledge on low-energyp collisions with the simplest two-electron molecule H 2 is rather poor [1,5], especially, concerning theory [2,11].…”

Section: Introductionmentioning

confidence: 99%