Transport theory for low-energy positron thermalization and annihilation in helium
Transport theory for low-energy positron thermalization and annihilation in helium
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DOI：
10.1103/physreva.89.022712
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发表时间：
2014-02
影响因子：
2.9
通讯作者：
G. Boyle;M. Casey;R. White;J. Mitroy
中科院分区：
文献类型：
--
作者：
G. Boyle;M. Casey;R. White;J. Mitroy
一个运输理论，明确纳入损失的磁通量由于湮灭碰撞的发展和应用到低能量正电子扩散和湮灭。使用更完整的动量转移和湮灭截面的氦导致改进的描述的时间依赖性的正电子注入气态氦。类似地，湮灭区浸没在电场中的实验中的相对于E/n（0）的变化与实验数据更接近。由于湮灭通量损失的列入被发现有一个非常小的影响，推导氦。
A transport theory that explicitly incorporates loss of flux due to annihilating collisions is developed and applied to low-energy positron diffusion and annihilation. The use of more complete momentum transfer and annihilation cross sections for helium has resulted in improved descriptions of the time dependence of for positrons injected into gaseous helium. Similarly, the variation of versus E/n(0) for experiments where the annihilation region is immersed in an electric field is in closer agreement with experimental data. Inclusion of loss of flux due to annihilation was found to have a very small effect on the derived for helium.