Many-body theory of positronium scattering and pickoff annihilation in noble-gas atoms
نویسندگان
چکیده
The many-body-theory approach to positronium-atom interactions developed in [Phys. Rev. Lett. \textbf{120}, 183402 (2018)] is applied the sequence of noble-gas atoms He-Xe. Dyson equation solved separately for an electron and positron moving field atom, with entire system enclosed a hard-wall spherical cavity. two-particle give energies wave functions Ps eigenstates From these, we determine scattering phase shifts cross sections, values pickoff annihilation parameter $^1Z_\text{eff}$ including short-range electron-positron correlations via vertex enhancement factors. Comparisons are made available experimental data elastic momentum-transfer sections $^1Z_\text{eff}$. Values He Ne, previously reported (2018)], found be near-perfect agreement experiment, Ar, Kr, Xe within factor 1.2.
منابع مشابه
Positronium formation from valence and inner shells in noble gas atoms
When recent experimental positronium (Ps) formation cross sections in noble gases have been compared with the most up-to date theoretical studies, the agreement is qualitative, but not quantitative. In this paper we re-examine this process and show that at low energies Ps formation must be treated nonperturbatively. We also look at Ps formation with inner shell electrons.
متن کاملLow-energy Scattering of Positronium by Atoms
The survey reports theoretical studies involving positronium (Ps) atom scattering. Investigations carried out in last few decades have been briefly reviewed in this article. A brief description of close-coupling approximation (CCA), the firstBorn approximation (FBA) and the Born-Oppenheimer approximation (BOA) for Ps-Atom systems are made. The CCA codes of Ray et a1 [I-61 are reinvestigated usi...
متن کاملPositron Annihilation in Noble Gas Mixtures
Hara and Massey [1] have investigated the annihilation of positrons in Ar-CO mixtures while the present author studied the behaviour of positrons in the noble gas mixtures (Ne + Ar) [2] and (He-)-Ar) [3]. It has been found that the annihilation decay constant, A, depends quite sensitively on the nature of the gas mixture. Our calculations [3] indicate that it will be quite interesting to explor...
متن کاملMany-body Scattering Theory of Electronic Systems
This work reviews recent advances in the analytical treatment of the continuum spectrum of correlated few-body non-relativistic Coulomb systems. The exactly solvable two-body problem serves as an introduction to the non-separable three-particle system. For the latter case we discuss the existence of an approximate separability of the long and the short-range dynamics which is exposed in an appr...
متن کاملMany - body theory of gamma spectra from positron - atom annihilation
A many-body theory approach to the calculation of gamma spectra of positron annihilation on many-electron atoms is developed. We evaluate the first-order correlation correction to the annihilation vertex and perform numerical calculations for the noble gas atoms. Extrapolation with respect to the maximal orbital momentum of the intermediate electron and positron states is used to achieve conver...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical review
سال: 2023
ISSN: ['0556-2813', '1538-4497', '1089-490X']
DOI: https://doi.org/10.1103/physreva.107.042802