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Ferrell很早就提出了正电子素o-Ps的猝灭理论,指出介质中的顺磁性粒子是影响o-Ps寿命的重要因素.Lee等测出O_2猝灭o-Ps的速率常数为10~(10)～10~(11)mol·L~(-1)·s~(-1),得出了顺磁猝灭反应是扩散控制的结论.但前人没有对云团中瞬态活性粒子对o-Ps的影响加以探讨.本文通过o-Ps寿命与氧分压的关系来研究云团中瞬态活性粒子对o-Ps猝灭的影响.
Ferrell proposed the quenching theory of positronin O-Ps for a long time and pointed out that the paramagnetic particles in the medium are the important factors affecting the lifetime of o-Ps.Lee et al determined the rate constants of o-Ps quenching O_2 to 10 ~ (10) ~ 10 ~ (11) mol·L -1 s -1, it is concluded that the paramagnetic quenching reaction is controlled by diffusion, but no previous studies on transient activity in the cloud Particle on the o-Ps to explore the relationship between o-Ps life and partial pressure of oxygen in the cloud to transient active particles on the o-Ps quenching.