GeV重离子束辐照LiF引起的晶体内部结构改变

陈宇鹏; 史路林; 王瑜玉; 程锐; 杨杰; 陈良文; 范伟丽; 董俊煜

doi:10.7498/aps.73.20240717

摘要

高能强流重离子束入射到固体物质中, 沿飞行路径的离子能量沉积密度将改变宏观靶物质的温度和压强等, 并可能在高压高密条件下产生新的材料缺陷. 本文利用兰州重离子加速器装置HIRFL-CSR引出的能量为264 MeV/u 的Xe³⁶⁺离子束, 入射到LiF晶体靶物质中, 在线测量了LiF的发射光谱, 观测到沿离子路径的晶体颜色变化. 通过解离方法取得了不同位置处的X射线衍射(X-ray Diffraction)与X射线光电子能谱结果, 显示在Xe离子的布拉格峰区域出现了LiF₃ (LiF+F₂)结构相, 讨论了新的结构缺陷的产生与重离子束能量沉积密度间可能的相关性. 这为离子束驱动的高能量密度物理的能量沉积过程提供了一定参考.

关键词:

LiF晶体 /
重离子束 /
能量密度 /
色心

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.

Keywords:

作者及机构信息

1.
河北大学物理与科学技术学院, 保定　071002

2.
中国科学院近代物理研究所, 兰州　730000

3.
西北师范大学物理与电子工程学院, 兰州　730070

4.
先进能源科学与技术广东省实验室, 惠州　516000

通信作者: 王瑜玉, wangyuyu@impcas.ac.cn

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.

Authors and contacts

1.
School of Physics and Science and Technology, Hebei University, Baoding 071002, China

2.
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China

3.
School of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China

4.
Advanced Energy Science and Technology Guangdong Provincial Laboratory, Huizhou 516000, China

Corresponding author: Wang Yu-Yu, wangyuyu@impcas.ac.cn

Funds: 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).

文章全文 : translate this paragraph

参考文献

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施引文献

图 1 (a)基于HIRFL装置的重离子束打靶实验装置示意图; (b)靶区内各装置位置示意图

Fig. 1. (a) Schematic diagram of heavy ion beam targeting experimental setup based on HIRFL; (b) diagram of the positions of devices within the target area.

下载: 全尺寸图片幻灯片

图 2 260 MeV/u的Xe³⁶⁺ 离子轰击LiF晶体的在线发光光谱结果　(a)在线发光光谱的峰位分布; (b)不同辐射剂量下的光谱强度演化(其中p代表束流脉冲发次)

Fig. 2. Luminescence spectrum of 260 MeV/u Xe³⁶⁺ ion bombardment on LiF crystals: (a) The peak position distribution of the luminescence spectrum; (b) the spectral intensity evolution at different radiation doses (where p represents the number of beam pulses).

下载: 全尺寸图片幻灯片

图 3 Xe³⁶⁺辐照后的LiF样品图以及沿束流方向解离示意图, 图中箭头指向面即图4(a)相应的测试面(不代表实际测试位置, 测试位置位于每个切面中心变色处)

Fig. 3. Diagram of LiF sample after irradiation with Xe³⁶⁺ and schematic diagram of dissociation along the beam direction. The arrow in the figure points to the corresponding testing surface in Fig. 4(a) (which does not represent the actual testing position, and the testing position is located at the discoloration point at the center of each section).

下载: 全尺寸图片幻灯片

图 4 (a) Xe³⁶⁺离子束轰击后LiF晶体各解离面的XRD测试结果; (b)区域3的XRD对比图

Fig. 4. (a) XRD test results of various dissociation surfaces of LiF crystals after Xe³⁶⁺ ion beam bombardment; (b) XRD comparison diagram in region 3.

下载: 全尺寸图片幻灯片

图 5 XPS分析结果　(a)前7个面的测量结果; (b)最后一个面的测量结果

Fig. 5. XPS analysis results: (a) The measurement results of the first seven faces; (b) the measurement results of the last face.

下载: 全尺寸图片幻灯片

[1]	Kang W, Du Y, Cao S, et al. 2020 Sci. Sin. Phys. Mech. Astron. 50 112004 Google Scholar
[2]	Yang J, Chen Y, Shen G, et al. 2020 Sci. Sin. Phys. Mech. Astron. 50 112011 Google Scholar
[3]	Matsubayashi M, Faenov A, Pikuz T, et al. 2011 Nucl. Instrum. Methods Phys. Res. Sect. Accel. Spectrometers Detect. Assoc. Equip. 651 90 Google Scholar
[4]	Perez A, Davenas J, Dupuy C H S 1976 Nucl. Instrum. Methods 132 219 Google Scholar
[5]	Wangts Z G, Dufourtt C, Paumiertt E, Toulemoude M 1994 J. Phys.: Condens. Matter 6 6733 Google Scholar
[6]	Perez A, Balanzat E, Dural J 1990 Phys. Rev. B 41 3943 Google Scholar
[7]	Trautmann C, Toulemonde M, Schwartz K, et al. 2000 Nucl. Instrum. Methods Phys. Res. Sec. B 164–165 365 Google Scholar
[8]	El-Said A S, Cranney M, Ishikawa N, et al. 2004 Nucl. Instrum. Methods Phys. Res. Sect. B 218 492 Google Scholar
[9]	Müller A, Neumann R, Schwartz K, Trautmann C 1998 Nucl. Instrum. Methods Phys. Res. Sect. B 146 393 Google Scholar
[10]	Toulemonde M, Assmann W, Trautmann C, Grüner F 2002 Phys. Rev. Lett. 88 057602 Google Scholar
[11]	Trautmann C, Schwartz K, Geiss O 1998 J. Appl. Phys. 83 3560 Google Scholar
[12]	Schwartz K, Trautmann C, Steckenreiter T, Geiß O, Krämer M 1998 Phys. Rev. B 58 11232 Google Scholar
[13]	Davidson A T, Schwartz K, Comins J D, Kozakiewicz A G, Toulemonde M, Trautmann C 2002 Phys. Rev. B 66 214102 Google Scholar
[14]	Schwartz K, Trautmann C, El-Said A S, Neumann R, Toulemonde M, Knolle W 2004 Phys. Rev. B 70 184104 Google Scholar
[15]	Pikuz T, Faenov A, Fukuda Y, et al. 2012 Opt. Express 20 3424 Google Scholar
[16]	Lushchik A, Lushchik Ch, Schwartz K, et al. 2007 Phys. Rev. B 76 054114 Google Scholar
[17]	Thevenard P, Guiraud G, Dupuy C H S, Delaunay B 1977 Radiat. Eff. 32 83 Google Scholar
[18]	Knutsont D, Bray P J 1966 J. Phys. Chem. Solids. 27 147-161.Google Scholar
[19]	Dauletbekova A, Schwartz K, Sorokin M V, et al. 2015 Nucl. Instrum. Methods Phys. Res. Sect. B 359 53 Google Scholar
[20]	Ditter M, Becher M, Orth S, et al. 2019 Nucl. Instrum. Methods Phys. Res. Sect. B 441 70 Google Scholar

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GeV重离子束辐照LiF引起的晶体内部结构改变