Positronium formation in low energy s-wave positron-helium scattering
Positronium formation in low energy s-wave positron-helium scattering
复制标题
低能横波正电子氦散射中的正电子形成
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
J. W. Humberston
中科院分区：
文献类型：
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作者：
P. V. Reeth;J. W. Humberston
一个两通道版本的科恩变分法是用非常灵活的试验波函数和精心制作的氦目标波函数，以获得准确的值的s波弹性和正电子形成截面的正电子-氦散射在矿石间隙。正电子素形成截面显示出与正电子-氢散射中发现的行为相似的行为，从阈值快速上升，然后在较高能量下缓慢上升。这个横截面的小幅度与最近对实验结果的分析结果一致。调查也作出了弹性散射截面附近的正电子素形成阈值的行为。
A two channel version of the Kohn variational method is used with very flexible trial wavefunctions and elaborate helium target wavefunctions to obtain accurate values of the s-wave elastic and positronium-formation cross sections for positron-helium scattering in the Ore gap. The positronium-formation cross section displays a similar behaviour to that found in positron-hydrogen scattering, with a rapid rise from threshold followed by a slowly rising plateau at the higher energies. The small magnitude of this cross section is consistent with the findings of a recent analysis of the experimental results. Investigations are also made of the behaviour of the elastic-scattering cross section near to the positronium-formation threshold.