Helium-antihydrogen scattering at low energies

被引：7
|
作者：
Jonsell, S. [1 ]
Armour, E. A. G. [2 ]
Plummer, M. [3 ]
Liu, Y. [2 ]
Todd, A. C. [2 ]
机构：
[1] Stockholm Univ, Dept Phys, SE-10691 Stockholm, Sweden
[2] Univ Nottingham, Sch Math Sci, Nottingham NG7 2RD, England
[3] STFC Daresbury Lab, Warrington WA4 4AD, Cheshire, England
来源：
NEW JOURNAL OF PHYSICS | 2012年 / 14卷
基金：
英国工程与自然科学研究理事会; 瑞典研究理事会;
关键词：
POSITRON-ANNIHILATION; HE; APPROXIMATION; MOLECULES; ATOMS;
D O I：
10.1088/1367-2630/14/3/035013
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We calculate cross sections for helium-antihydrogen scattering for energies up to 0.01 atomic unit. Our calculation includes elastic scattering, direct antiproton-alpha particle annihilation and rearrangement into He(+)p(-) and ground-state positronium. Elastic scattering is calculated within the Born-Oppenheimer approximation using the potential calculated by Strasburger et al (2005 J. Phys. B: At. Mol. Opt. Phys. 38 3091). Matrix elements for rearrangement are calculated using the T-matrix in the distorted wave approximation, with the initial state represented by Hylleraas-type functions. The strong force, leading to direct annihilation, was included as a short-range boundary condition in terms of the strong-force scattering length.
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页数：16
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