Scattering of protons and antiprotons by hydrogen atoms

Tantawi, Reda S.; Sabbah, A. S.

doi:10.1088/1009-1963/11/12/308

Cited by 7 publications

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“…As was noted earlier, the polarization parameter A 20 is a good quantity to test the current model. In figure 4, this quantity is thus plotted over the energy range of 100 keV-1 MeV for the present results and compared with those from a theoretical 14state impact parameter [21] calculation, a BGM calculation The polarization Lyman-α coefficients calculated presently, solid line, compared with that of the experimental results of [13], dashed line, theoretical results of [13], dash-dotted line, and a theoretical approximation 14-state impulse parameter results [21], dotted line.…”

Section: Resultsmentioning

confidence: 95%

“…We will later compare the results of our calculation, which is based on a three-body Faddeev formalism to the available experimental [8,13] and theoretical [20,21] data in the literature. This study is following on from our previous work [22], to which we refer the reader.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 4. The polarization Lyman-α coefficients calculated presently, solid line, compared with that of the experimental results of[13], dashed line, theoretical results of[13], dash-dotted line, and a theoretical approximation 14-state impulse parameter results[21], dotted line.…”

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confidence: 99%

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Polarization of Lyman-α and Balmer-α emission in proton–hydrogen collisions: a study using first-order Born–Faddeev-type equations

Fathi

Bolorizadeh

Akbarabadi

et al. 2012

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

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A three-body Born-Faddeev model is devised to calculate the total cross sections of Balmer-α and Lyman-α emissions, for the excitation of hydrogen atoms by proton impact in the energy range of 100 keV-7 MeV. In addition, the polarization alignment factor A 20 is calculated and compared against available experimental data to further test the theory. Specifically, here we use the Faddeev-Watson-Lovelace formalism to study the excitation of atomic hydrogen from its ground state to the excited states of n = 2 and 3 and magnetic sublevels l = 0, 1 and 2, wherever applicable. The first-order electronic, A (1) e , and the first-order nuclear, A (1) n , amplitudes are considered in order to calculate the excitation transition matrix (T PT ), while a near-the-shell condition is assumed throughout. In addition, our results were used to calculate the first-order form factors. The present results are compared, where possible, with those of other theoretical and experimental works that are currently available in the literature.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Polarization of Lyman-α and Balmer-α emission in proton–hydrogen collisions: a study using first-order Born–Faddeev-type equations

Fathi

Bolorizadeh

Akbarabadi

et al. 2012

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

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“…Figure 1. The present alignment parameters compared with those of the fourteen state impact parameter [2] and the experiment [3].…”

Section: Synopsismentioning

confidence: 99%

Polarization of Lyman-Alpha and Balmer-Alpha in proton-hydrogen collision measured under three-body Faddeev type formalism

Fathi

Bolorizadeh

Akbarabadi

2012

J. Phys.: Conf. Ser.

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“…An impact parameter approach, based on a onecenter expansion in atomic orbitals, was applied to study the influence of the sign of the projectile charge, [14] and the back couplings to the initial state, [15] on the impact excitation of H(1𝑠) atoms by protons and antiprotons. It was found that the backcoupling reduces the cross sections and plays an important role in the case of the antiproton scattering being much larger than in the proton case.…”

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Impact Excitations of Hydrogen Atoms in Collisions with Protons and Antiprotons

Tantawi

Nassar

2014

Chinese Phys. Lett.

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The direct impact excitations of ground-state hydrogen atoms by protons and antiprotons are investigated by using an impact parameter treatment. The calculations are performed within the solution of the coupled differential equations arising from the one-center atomic-orbital close-coupling approach as well as the impact parameter version of the first and second Born approximations. We have considered calculations that allow couplings to the 𝑛=1-5 states (up to g sub-levels) of the target atom as well as others, which neglect the effect of all states other than the initial and final states of the target atom. The sensitivity of the cross sections to the charge of the projectile is studied. The calculated cross sections are compared with those obtained by previous theoretical and experimental results.

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Scattering of protons and antiprotons by hydrogen atoms

Cited by 7 publications

References 0 publications

Polarization of Lyman-α and Balmer-α emission in proton–hydrogen collisions: a study using first-order Born–Faddeev-type equations

Polarization of Lyman-α and Balmer-α emission in proton–hydrogen collisions: a study using first-order Born–Faddeev-type equations

Polarization of Lyman-Alpha and Balmer-Alpha in proton-hydrogen collision measured under three-body Faddeev type formalism

Impact Excitations of Hydrogen Atoms in Collisions with Protons and Antiprotons

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