Effect of positron source irradiation on positronium annihilation in fine powdered alumina
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- 作者：Z.W. Liu ; Z.Q. Chen
- 关键词：Positron irradiation ; Surface ; γ-Al2O3 ; Positronium ; Paramagnetic
- 刊名：Applied Surface Science
- 出版年：2016
- 出版时间：30 September 2016
- 年：2016
- 卷：382
- 期：Complete
- 页码：10-14
- 全文大小：918 K
文摘
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Effect of positron irradiation was studied using both positron lifetime and Doppler.
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Positron source irradiation creates paramagnetic centers on the surface of alumina.
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Paramagnetic centers induced spin conversion quenching of positronium.
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Paramagnetic centers are unstable above 70 K and nearly vanish above 190 K.
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Positronium is a sensitive probe for the surface defects in porous materials.