Positron scattering and annihilation from helium at low energies

被引：1

作者：

Li, Xian-Jun ^{[1
,2
]}

Wu, Meng-Shan ^{[3
]}

Jiang, Jun ^{[1
]}

Dong, Chen-Zhong ^{[1
]}

Zhang, Jun-Yi ^{[2
]}

Yan, Zong-Chao ^{[2
,4
]}

Varga, Kalman ^{[5
]}

机构：

[1] Northwest Normal Univ, Coll Phys & Elect Engn, Key Lab Atom & Mol Phys & Funct Mat Gansu Prov, Lanzhou 730070, Peoples R China

[2] Chinese Acad Sci, Innovat Acad Precis Measurement Sci & Technol, Wuhan 430071, Peoples R China

[3] Hainan Univ, Ctr Theoret Phys, Haikou 570228, Peoples R China

[4] Univ New Brunswick, Dept Phys, Fredericton, NB E3B 5A3, Canada

[5] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

来源：

PHYSICAL REVIEW A | 2023年 / 108卷 / 06期

基金：

中国国家自然科学基金; 加拿大自然科学与工程研究理事会;

关键词：

ELASTIC-SCATTERING; CROSS-SECTIONS; HE; IONIZATION; NEON; AR;

D O I：

10.1103/PhysRevA.108.062816

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The confined variational method is used to study the elastic scattering of the positron from the ground-state helium with the scattering energy in the range from 0.05 eV to 11.02 eV. Describing the correlation effect with explicitly correlated Gaussians, we obtain accurate phase shifts, S-wave scattering length, elastic scattering cross sections, and annihilation parameters for different incident momenta. Specifically, by a least-squares fit of the data to the effective-range theory, we determine the room temperature annihilation parameter Zeff = 3.955, which is in perfect agreement with the measured result of 3.94 +/- 0.02 [J. Phys. B 8, 1734 (1975)].

引用

页数：8

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