Void nucleation and positronium formation are studied by positron annihilationlifetime technique in α-Al<sub>2</sub>O<sub>3</sub> irradiated by E<sub>n</sub>≥1 MeV fast neutrons t...Void nucleation and positronium formation are studied by positron annihilationlifetime technique in α-Al<sub>2</sub>O<sub>3</sub> irradiated by E<sub>n</sub>≥1 MeV fast neutrons to a fluence of 3×10<sup>20</sup> n/cm<sup>2</sup>.The voids of 0.7 nm are observed in the irradiated α-Al<sub>2</sub>O<sub>3</sub> after the post-irradiationannealing at 850℃ and the positronium is formed in the voids.展开更多
文摘Void nucleation and positronium formation are studied by positron annihilationlifetime technique in α-Al<sub>2</sub>O<sub>3</sub> irradiated by E<sub>n</sub>≥1 MeV fast neutrons to a fluence of 3×10<sup>20</sup> n/cm<sup>2</sup>.The voids of 0.7 nm are observed in the irradiated α-Al<sub>2</sub>O<sub>3</sub> after the post-irradiationannealing at 850℃ and the positronium is formed in the voids.
