【摘要】 用时间选择能谱仪-磁猝灭测量方法并经适当数据处理,研究了聚四氟乙烯高聚物中正电子湮没寿命谱中等成份(～lns)的湮没过程性质.确定其为自旋三重态正电子素即o-Ps的猝灭。更多还原

【Abstract】 The nature of the medium lifetime component of positron annihilation in Teflon (PTFE) polymer has been investigated by using a recently developed time-selecting γ ray energy spectrometer with and without magnetic field. It has been assigned to o-Ps quenching annihilation too, just like the case of the longest lifetime component.更多还原