Many-body theory for positronium-atom interactions

Abstract

A many-body-theory approach has been developed to study positronium-atom interactions. As first applications, we calculate the elastic scattering and momentum-transfer cross sections and the pickoff annihilation rate ${}^1{Z}_{\text{eff}}$ for Ps collisions with He and Ne. The cross section for He is in agreement with previous coupled-state calculations, and the momentum-transfer cross section for Ne agrees with available experimental data. ${}^1{Z}_{\text{eff}}$ is found to be 0.13 and 0.26 for He and Ne, respectively, in excellent agreement with the measured values.

Accepted by Phys. Rev. Lett. (V2 contains update to text and Figs. 3 and 5. V3 contains further discussion on the calculation of pickoff annihilation rates.)

References in corpus (9)

• Many-body theory of positron-atom interactions
• Positron scattering and annihilation on noble gas atoms
• $\gamma$-ray spectra and enhancement factors for positron annihilation spectra with core-electrons
• Calculations of positronium-atom scattering using a spherical cavity
• Positron cooling and annihilation in noble gases
• Effective radius of ground- and excited-state positronium in collisions with hard walls
• van der Waals coefficients for positronium interactions with atoms
• Probing positron cooling in noble gases via annihilation $\gamma$ spectra
• Enhancement factors for positron annihilation on valence and core orbitals of noble-gas atoms

Cited by in corpus (9)

• Calculations of positron binding and annihilation in polyatomic molecules
• Model-potential calculations of positron binding, scattering, and annihilation for atoms and small molecules, using a Gaussian basis
• Many-Body Theory Calculations of Positron Scattering and Annihilation in H${}_2$, N${}_2$ and CH${}_4$
• S-wave elastic scattering of $o$-Ps from ${\text{H}}_2$ at low energy
• Time-Dependent Multi-Component Density Functional Theory for Coupled Electron-Positron Dynamics
• Many-body theory for positronium scattering and pickoff annihilation in noble-gas atoms
• Many-body theory predictions of positron binding energies in five-membered heterocycles involving N, O, S and NH substituents
• Dissociative positronium attachment in halogen gases
• Self annihilation of confined positronium