School of Physical Science and Technology Sichuan University Chengdu 610064 China;
Institute of Electricity Engineering CAEP Mianyang 621900 China;
School of Physical Science and Technology Sichuan University Chengdu 610064 China;
Key Laboratory of Radiation Physics and Technology(Sichuan University) Ministry of Education Chengdu 610064 China;
School of Physical Science and Technology Sichuan University Chengdu 610064 China;