Positron irradiation effect on positronium formation in gamma-irradiated LDPE and unplasticized PVC
文献类型：期刊论文
| 作者 | Wang BY(王宝义) ; Yu RS(于润升); Cao XZ(曹兴忠); Zhang P(张鹏); Yang J(杨静); Wang, BY; Yu, RS; Cao, XZ; Zang, P; Yang, J
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| 刊名 | RADIATION PHYSICS AND CHEMISTRY
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| 出版日期 | 2017 |
| 卷号 | 135页码:121-126 |
| 关键词 | Positron irradiation effect Positronium formation Temperature Light |
| ISSN号 | 0969-806X |
| DOI | 10.1016/j.radphyschem.2017.02.002 |
| 文献子类 | Article |
| 英文摘要 | Positron irradiation effects on positronium formation in low-density polyethylene (LDPE), gamma-irradiated LDPE and unplasticized PVC (UPVC) are studied. At least in one of the three different measurements, i.e., prolonged positron annihilation measurement at room temperature, low temperature in darkness and subsequent measurement under light, changes in o-Ps intensity are observed in non-irradiated LDPE and gamma-irradiated LDPE. While in UPVC, change in o-Ps intensity is hardly observable in all the above mentioned three measurements. Reduction of o-Ps intensity by light indicates that positronium formation via the recombination of a positron and a trapped electron exists in LDPE and gamma-irradiated LDPE. The absence of light bleaching effect, together with the fact that the value of o-Ps intensity in heating and cooling process of a thermal circle is nearly the same, indicates that in UPVC, positronium can not be formed through trapped electron mechanism. This study highlights the speciality of positronium formation in UPVC, positronium is formed exclusively by the recombination of electron-positron pairs with short separations. |
| WOS关键词 | ANNIHILATION LIFETIME ; TRAPPED ELECTRONS ; PS FORMATION ; POLYETHYLENE ; TEMPERATURE ; POLYPROPYLENE ; POLYMERS ; RELAXATION ; TRANSITION ; RADIATION |
| WOS研究方向 | Chemistry ; Nuclear Science & Technology ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000399846700018 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/284923]  |
| 专题 | 高能物理研究所_多学科研究中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Wang BY,Yu RS,Cao XZ,et al. Positron irradiation effect on positronium formation in gamma-irradiated LDPE and unplasticized PVC[J]. RADIATION PHYSICS AND CHEMISTRY,2017,135:121-126. |
| APA | 王宝义.,于润升.,曹兴忠.,张鹏.,杨静.,...&Yang, J.(2017).Positron irradiation effect on positronium formation in gamma-irradiated LDPE and unplasticized PVC.RADIATION PHYSICS AND CHEMISTRY,135,121-126. |
| MLA | 王宝义,et al."Positron irradiation effect on positronium formation in gamma-irradiated LDPE and unplasticized PVC".RADIATION PHYSICS AND CHEMISTRY 135(2017):121-126. |
入库方式： OAI收割
来源：高能物理研究所
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