物理学报2024，Vol.73Issue(15)：111-117,7.DOI:10.7498/aps.73.20240717
GeV重离子束辐照LiF引起的晶体内部结构改变
Internal structural changes in crystals induced by GeV heavy ion beam irradiation of LiF
摘要
Abstract
When an incident high-energy heavy ion beam enters into solid material,the energy deposition density along the ion flight path can change the temperature and pressure of macroscopic target,and new material defects can be created under the high-pressure and high-density conditions.To accurately control the extreme state in material generated by heavy ion beam,it is necessary to conduct in-depth research on the energy deposition density of ions and ascertain the new potential defects in matter.Reported in this work is the new experiment conducted on the HIRFL-CSR at Lanzhou,with the extracted 264 MeV/u Xe36+ion beams irradiating an LiF crystal target.The emission spectrum of the LiF is measured in-situ.Moreover,the crystal color is observed to vary along the ion path,and X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)are used to observe the potential new phases at different positions of crystal through the target dissociation method. It is apparent that in No.3-front a new phase around 52.6° is found in XRD result,which is believed to be LiF3(LiF+F2)structural phase and appears in the Bragg peak region of Xe ions in LiF.Furthermore,to verify this result,a similar experiment is done by using a 430 MeV/u 84Kr26+ion beam,and the stacked layered LiF target is analyzed after the irradiation.The XPS result shows more complex defects aggregating in the Bragg peak region of Kr ions in LiF at room temperature.In previous study,such complex defects were all created under high temperature conditions.We find that these complex defects can be produced around the Bragg peak region of ions in LiF at room temperature,resulting in a temporally high temperature and high pressure condition.This paper can provide some experimental evidences and references for the target material modification in heavy ion beam driven high-energy density physics research.关键词
LiF晶体/重离子束/能量密度/色心Key words
LiF crystal/heavy ion beam/energy density/color center引用本文复制引用
陈宇鹏,史路林,王瑜玉,程锐,杨杰,陈良文,范伟丽,董俊煜..GeV重离子束辐照LiF引起的晶体内部结构改变[J].物理学报,2024,73(15):111-117,7.基金项目
国家重点研发计划(批准号:2022YFA1602500)、国家自然科学基金国际(地区)合作与交流项目(批准号:12120101005)和国家自然科学基金(批准号:12205247)资助的课题.Project supported by the National Key Research and Development Program(Grant No.2022YFA1602500),the National Natural Science Foundation of China for International(Regional)Cooperation and Exchange(Grant No.12120101005),and the National Natural Science Foundation of China(Grant No.12205247). （批准号:2022YFA1602500）
