3 years ago

Dipole enhancement of the protonium formation cross section in antiproton collisions with excited hydrogen atoms

Kazuhiro Sakimoto


Between an ion and a hydrogen (H) atom in an excited state, there exists an effectively isotropic interaction potential which behaves as 1/R2 at large separations R. The abnormal long-range part, stemming from the energy degeneracy peculiar to the H system, is expected to have a drastic influence on the low-energy collision processes. The present paper addresses this issue by considering protonium (p) formation in antiproton () collisions with excited H atoms. The calculation of the p formation process is carried out by means of a semiclassical (quantum-classical hybrid) approach. At low collision energies E, the formation cross section is found to be far above the so-called Langevin cross section and reveals the E-1 dependence. This result is in clear contrast to that for the H atoms in the ground state with no degeneracy.

Graphical abstract

Publisher URL: https://link.springer.com/article/0.1140/epjd/e2017-80394-0

DOI: 10.1140/epjd/e2017-80394-0

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.