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Sökning: WFRF:(Yamashita Takuma) > (2021)

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1.
  • Yamashita, Takuma, et al. (författare)
  • Four-body Calculation of Inelastic Scattering Cross Sections of Positronium-Antihydrogen Collision
  • 2021
  • Ingår i: Few-body systems. - : Springer Science and Business Media LLC. - 0177-7963 .- 1432-5411. ; 62:4
  • Tidskriftsartikel (refereegranskat)abstract
    • We overview our recent calculations of scattering cross sections of positronium–antihydrogen collisions. We discuss the cross sections calculated in the vicinity of the four-body resonances of H¯Ps and above the energy threshold for the formation of the antihydrogen positive ions (H¯+). In the former energy region where a Rydberg series of resonances dominated by the H¯+-e− interaction appears, we show a good agreement between the resonant profiles in the cross sections and the resonance energies calculated by the complex coordinate rotation method. H¯+ production cross sections near the threshold energy are reported for the positronium being initially in the (n, l) states with n≤3, together with all competing elastic/inelastic cross sections. Comparison of our results with the latest continuum distorted wave final state calculation is presented. A qualitative discrepancy concerning the dependence of cross sections on the angular momentum of Ps is indicated.
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2.
  • Yamashita, Takuma, et al. (författare)
  • Near-threshold production of antihydrogen positive ion in positronium-antihydrogen collision
  • 2021
  • Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 23:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Near-threshold production of antihydrogen ion (H+) in positronium-antihydrogen collisions is predicted by a rigorous four-body scattering calculation. The convergence of the cross sections for the rearrangement and for all competing reactions (elastic scattering, de/excitation and de/polarization of positronium) is carefully examined against partial waves. The multi-channel scattering solutions are composed of functions that diagonalize the four-body Hamiltonian, and scattering functions that satisfy the correct asymptotic boundary conditions. The production rates of H+ show large discrepancies compared to more approximate calculations.
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  • Resultat 1-2 av 2
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tidskriftsartikel (2)
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refereegranskat (2)
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Froelich, Piotr (2)
Jonsell, Svante (2)
Yamashita, Takuma (2)
Kino, Yasushi (2)
Hiyama, Emiko (2)
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Uppsala universitet (2)
Stockholms universitet (2)
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Engelska (2)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (2)
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2021 (2)Ta bort avgränsningen

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