About the Authors
- Yu Li
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Affiliation Applied Ion Beam Physics Laboratory (Key Laboratory of the Ministry of Education), Institute of Modern Physics, Fudan University, Shanghai, People's Republic of China
- Bin Zhang
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* E-mail: binzhang@fudan.edu.cn
Affiliation Applied Ion Beam Physics Laboratory (Key Laboratory of the Ministry of Education), Institute of Modern Physics, Fudan University, Shanghai, People's Republic of China
- Huansheng Cheng
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Affiliation Applied Ion Beam Physics Laboratory (Key Laboratory of the Ministry of Education), Institute of Modern Physics, Fudan University, Shanghai, People's Republic of China
- Jianming Zheng
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Affiliation Zhejiang Provincial Institute of Cultural Relics and Archaeology, Hangzhou, Zhejiang, People's Republic of China
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: BZ HC. Performed the experiments: YL BZ HC. Analyzed the data: YL BZ. Contributed reagents/materials/analysis tools: JZ. Wrote the paper: YL BZ.