Measurement of the displacement cross-section of copper irradiated with 125 MeV protons at 12 K
Measurement of the displacement cross-section of copper irradiated with 125 MeV protons at 12 K
复制标题
12 K 下 125 MeV 质子辐照铜的位移截面测量
DOI：
10.1016/j.jnucmat.2014.12.125
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发表时间：
2015
影响因子：
3.1
通讯作者：
Toru Ogitsu
中科院分区：
文献类型：
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作者：
Yosuke Iwamoto;Toshimasa Yoshiie;Makoto Yoshida;Tatsushi Nakamoto;Masaaki Sakamoto;Yasutoshi Kuriyama;Tomonori Uesugi;Yoshihiro Ishi;Qiu Xu;Hiroshi Yashima;Fumiaki Takahashi;Yoshiharu Mori;Toru Ogitsu
为了验证蒙特卡罗代码预测 >100 MeV 质子辐照金属的辐射损伤，在 12 K 下用 125 MeV 质子辐照测量了与铜位移横截面相关的缺陷引起的电阻率变化。低温辐照系统采用 Gifford-McMahon 低温冷却器开发，通过无氧高电导铜板通过传导冷却来冷却样品。样品是夹在两片氮化铝陶瓷片之间的直径为 250 微米、纯度为 99.999% 的铜线。使用四探针技术测量铜线的电阻率变化。在12 K下以1.45 × 1018质子/m2进行125 MeV质子辐照后，总电阻率增加为4.94 × 10−13Ω m（电阻增加：1.53 μΩ），而辐照前铜的电阻率为9.44 × 10−12Ω m（电阻：29.41 μΩ）。在低于 15 K 的辐照后退火期间，电阻率增加没有变化。125 MeV 辐照的实验位移横截面显示与 1.1 和 1.94 GeV 的实验数据相似的结果。与计算结果的比较表明，蒙特卡罗代码中的缺陷产生效率很好地定量描述了>100 MeV能量区域的位移截面。
To validate Monte Carlo codes for the prediction of radiation damage in metals irradiated by >100 MeV protons, the defect-induced electrical resistivity changes related to the displacement cross-section of copper were measured with 125 MeV proton irradiation at 12 K. The cryogenic irradiation system was developed with a Gifford–McMahon cryocooler to cool the sample via an oxygen-free high-conductivity copper plate by conduction cooling. The sample was a copper wire with a 250-μm diameter and 99.999% purity sandwiched between two aluminum nitride ceramic sheets. The electrical resistivity changes of the copper wire were measured using the four-probe technique. After 125 MeV proton irradiation with 1.45 × 1018protons/m2at 12 K, the total resistivity increase was 4.94 × 10−13Ω m (resistance increase: 1.53 μΩ), while the resistivity of copper before irradiation was 9.44 × 10−12Ω m (resistance: 29.41 μΩ). The resistivity increase did not change during annealing after irradiation below 15 K. The experimental displacement cross-section for 125 MeV irradiation shows similar results to the experimental data for 1.1 and 1.94 GeV. Comparison with the calculated results indicated that the defect production efficiency in Monte Carlo codes gives a good quantitative description of the displacement cross-section in the energy region >100 MeV.