https://doi.org/10.1140/epjd/s10053-025-01100-z
Research - Atoms, Molecules, Ions, and Clusters
Positron-helium bound states in the scattering of polarized helium and orthopositronium
Department of Earth, Environment and Physics, Worcester State University, 01602, Worcester, MA, USA
a
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Received:
6
August
2025
Accepted:
20
November
2025
Published online:
2
February
2026
The formation of positron-helium bound states in a single rearrangement collision between spin-polarized beams of triplet helium and orthopositronium is studied. The probabilities of producing both doublet and quartet bound states are calculated using angular-momentum coupling and the construction of density matrices. The spin scattering matrix for the process and a table containing the probabilities for all possible final states are provided. The probabilities are expressed in terms of the real parts of complex scattering amplitudes labeled with total electron spin and the angle between the polarization vectors of the beams. Differences between cases in which the beam spins are aligned and those in which they are oppositely aligned are noted. The product of the polarization tensors of the beams is written as a function of the probabilities for certain angles. A description of how the real parts of the scattering amplitudes and annihilation rates for the bound states could be determined is given.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
