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Li, Xian-Jun; Wu, Meng-Shan; Jiang, Jun; Dong, Chen-Zhong; Zhang, Jun-Yi; Yan, Zong-Chao; Varga, Kalman (, Physical Review A)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)].more » « less
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Liang, Shi-Yong; Zhang, Ting-Xian; Guan, Hua; Lu, Qi-Feng; Xiao, Jun; Chen, Shao-Long; Huang, Yao; Zhang, Yong-Hui; Li, Cheng-Bin; Zou, Ya-Ming; et al (, Physical Review A)null (Ed.)