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Search: WFRF:(Yamashita Takuma) > (2017)

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  • Yamashita, Takuma, et al. (author)
  • A coupled rearrangemnet channel analysis of positronium antihydride PsH
  • 2017
  • In: Journal of Physics, Conference Series. - : Institute of Physics (IOP). - 1742-6588 .- 1742-6596. ; 875
  • Journal article (peer-reviewed)abstract
    • Ground and resonance states of PsH are calculated with a coupled rearrangement-channel, four-body calculation. The structures of these states are examined with help of correlation functions and probabilities of finding two-body states in the total wavefunction. Asymptotic configurations of the ground and resonance states are determined from the tail behaviour of the correlation functions.
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2.
  • Yamashita, Takuma, et al. (author)
  • Bound and resonance states of positronic copper atoms
  • 2017
  • In: Journal of Physics B. - : IOP Publishing. - 0953-4075 .- 1361-6455. ; 50:20
  • Journal article (peer-reviewed)abstract
    • We report a theoretical calculation for the bound and S-wave resonance states of the positronic copper atom (e(+) Cu). A positron is a positively charged particle; therefore, a positronic atom has an attractive correlation between the positron and electron. A Gaussian expansion method is adopted to directly describe this correlation as well as the strong repulsive interaction with the nucleus. The correlation between the positron and electron is much more important than that between electrons in an analogous system of Cu-, although the formation of a positronium (Ps) in e(+) Cu is not expressed in the ground state structure explicitly. Resonance states are calculated with a complex scaling method and identified above the first excited state of the copper atom. Resonance states below Ps (n = 2) + Cu+ classified to a dipole series show agreement with a simple analytical law. Comparison of the resonance energies and widths of e(+) Cu with those of e(+) K, of which the potential energy of the host atom resembles that of e(+) Cu, reveals that the positions of the resonance for the e(+) Cu dipole series deviate equally from those of e(+) K.
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
Yamashita, Takuma (2)
Kino, Yasushi (2)
Froelich, Piotr (1)
Jonsell, Svante (1)
Umair, Muhammad (1)
Hiyama, Emiko (1)
University
Uppsala University (1)
Stockholm University (1)
Language
English (2)
Research subject (UKÄ/SCB)
Natural sciences (2)
Year
2017 (2)Undo refine

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