<正>Single crystal sapphire (Al2O3) samples were irradiated at 320 K by 208pb27+ ions with energy of 1.1 MeV/u to the fluences ranging from 1×1012 to 5
The total operation time of HIRFL is 7 536 h in 2015; the user beam time is about 5 451.5 (from 21 Dec.2014 to 21 Dec. 2015); 4 836 h were used for experiments;