Annihilation cross sections of protonium by ion impact: Scaling law with respect to the principal quantum number

L. Gulyás, A. Igarashi, A. Ohsaki

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1 Citation (Scopus)

Abstract

Annihilation cross sections of protonium (Pn) in collisions with proton or alpha particles are calculated for different nℓ initial states using a semi-classical close-coupling method (n and ℓ denote the principal and angular momentum quantum numbers, respectively). The annihilation is accounted for by the complex energies of the ns states describing the inter-nuclear interaction between proton and antiproton. At low-projectile velocities intra-shell transitions dominate the process, while at high-impact velocities the transitions between different shells must also be taken into account. Two different collision mechanisms, dipole and sudden, are found to dominate the process in the range of medium- and high-impact velocities, respectively. Scaling of the annihilation cross sections with n is discussed in relation to the scaling properties of coupling matrix elements.

Original languageEnglish
Article number055203
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume43
Issue number5
DOIs
Publication statusPublished - 2010

Fingerprint

ion impact
impact velocity
scaling laws
quantum numbers
scaling
collisions
protons
nuclear interactions
cross sections
antiprotons
alpha particles
projectiles
angular momentum
dipoles
momentum
matrices
energy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics

Cite this

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abstract = "Annihilation cross sections of protonium (Pn) in collisions with proton or alpha particles are calculated for different nℓ initial states using a semi-classical close-coupling method (n and ℓ denote the principal and angular momentum quantum numbers, respectively). The annihilation is accounted for by the complex energies of the ns states describing the inter-nuclear interaction between proton and antiproton. At low-projectile velocities intra-shell transitions dominate the process, while at high-impact velocities the transitions between different shells must also be taken into account. Two different collision mechanisms, dipole and sudden, are found to dominate the process in the range of medium- and high-impact velocities, respectively. Scaling of the annihilation cross sections with n is discussed in relation to the scaling properties of coupling matrix elements.",
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AU - Gulyás, L.

AU - Igarashi, A.

AU - Ohsaki, A.

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N2 - Annihilation cross sections of protonium (Pn) in collisions with proton or alpha particles are calculated for different nℓ initial states using a semi-classical close-coupling method (n and ℓ denote the principal and angular momentum quantum numbers, respectively). The annihilation is accounted for by the complex energies of the ns states describing the inter-nuclear interaction between proton and antiproton. At low-projectile velocities intra-shell transitions dominate the process, while at high-impact velocities the transitions between different shells must also be taken into account. Two different collision mechanisms, dipole and sudden, are found to dominate the process in the range of medium- and high-impact velocities, respectively. Scaling of the annihilation cross sections with n is discussed in relation to the scaling properties of coupling matrix elements.

AB - Annihilation cross sections of protonium (Pn) in collisions with proton or alpha particles are calculated for different nℓ initial states using a semi-classical close-coupling method (n and ℓ denote the principal and angular momentum quantum numbers, respectively). The annihilation is accounted for by the complex energies of the ns states describing the inter-nuclear interaction between proton and antiproton. At low-projectile velocities intra-shell transitions dominate the process, while at high-impact velocities the transitions between different shells must also be taken into account. Two different collision mechanisms, dipole and sudden, are found to dominate the process in the range of medium- and high-impact velocities, respectively. Scaling of the annihilation cross sections with n is discussed in relation to the scaling properties of coupling matrix elements.

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