Knowledge Management System Of Shanghai Institute of Applied Physics, CAS
| Positronium formation in a polymer blend of polyethylene and chlorinated polyethylene | |
| Wang, CL; Kobayashi, Y; Zheng, W; Zhang, C; Nagai, Y; Hasegawa, M | |
| 2001 | |
| Source Publication | PHYSICAL REVIEW B
 |
| ISSN | 1098-0121 |
| Volume | 63Issue:6 |
| Abstract | We discuss positronium (Ps) formation in a polymer blend system consisting of low-density polyethylene (PE) and chlorinated polyethylene (CPE, random copolymer with a chlorine weight content of 35%). Positron lifetime measurements were performed as a function of CPE composition (0-100%), electric field (F = 0-40 kV/cm), temperature (T=30-300 K), and positron irradiation time (t=0-110 h) at T=75 K, and room temperature. We note that Ps formation occurs by recombination of electron-positron pairs with both small (less than or similar to3 nm) and large (greater than or similar to3 nm) initial separations. At low temperatures, pairs with large separations are formed not only in the positron spur (blob) but also as a result of coupling of a thermalized positron with one of the localized electrons produced by positron irradiation. For PE, the contribution of the latter process to Ps formation appears as a gradual increase in relative intensity of the long-lived ortho-positronium (o-Ps) component as a function of positron irradiation time. The addition of CPE appreciably reduces the contribution from pairs with large separations, and Ps formation in pure CPE occurs exclusively from pairs with small initial separations, much less influenced by external parameters such as the temperature and electric field. |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 应物所项目组 |
| WOS ID | WOS:000166911400034 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.sinap.ac.cn/handle/331007/10105 |
| Collection | 中科院上海原子核所2003年前 |
| Recommended Citation GB/T 7714 | Wang, CL,Kobayashi, Y,Zheng, W,et al. Positronium formation in a polymer blend of polyethylene and chlorinated polyethylene[J]. PHYSICAL REVIEW B,2001,63(6). |
| APA | Wang, CL,Kobayashi, Y,Zheng, W,Zhang, C,Nagai, Y,&Hasegawa, M.(2001).Positronium formation in a polymer blend of polyethylene and chlorinated polyethylene.PHYSICAL REVIEW B,63(6). |
| MLA | Wang, CL,et al."Positronium formation in a polymer blend of polyethylene and chlorinated polyethylene".PHYSICAL REVIEW B 63.6(2001). |
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