Nishiura Yosuke, Inoue Shunsuke, Kojima Sadaoki, Teramoto Kensuke, Furukawa Yuki, Hashida Masaki, Sakabe Shuji
Advanced Research Center for Beam Science, Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
Rev Sci Instrum. 2019 Aug;90(8):083307. doi: 10.1063/1.5098863.
Alpha particles generated by Li(p,α)He and F(p,α)O reactions are selectively detected in the presence of abundant primary protons by reducing the proton sensitivity of CR-39 using a potassium hydroxide-ethanol-water (PEW) etching solution. These nuclear reactions are induced in a LiF crystal using the laser-accelerated protons (4 × 10 protons/pulse with a maximum energy of 3.3 MeV) generated and accelerated by the interaction of a 40-fs laser pulse with a polyethylene thin film target at a peak intensity of 5 × 10 W/cm. Subsequent etching of the CR-39 in the PEW solution (KOH: 17 wt. %; CHOH: 25 wt. %; HO: 58 wt. %) permits the selective detection of 4.0 MeV alpha particles, which is independently confirmed by an experiment using alpha particles from an Am source. The described method is expected to be useful for research into nuclear reactions in laser plasma.
通过使用氢氧化钾 - 乙醇 - 水（PEW）蚀刻溶液降低CR - 39对质子的敏感度，在存在大量初级质子的情况下，可选择性地检测由Li(p,α)He和F(p,α)O反应产生的α粒子。这些核反应是在LiF晶体中利用激光加速质子（4×10个质子/脉冲，最大能量为3.3 MeV）诱导产生的，该激光加速质子是由一个40飞秒激光脉冲与聚乙烯薄膜靶相互作用产生并加速的，峰值强度为5×10 W/cm 。随后在PEW溶液（KOH：17 wt.%；CHOH：25 wt.%；HO：58 wt.%）中对CR - 39进行蚀刻，可实现对4.0 MeV α粒子的选择性检测，这一结果通过使用来自Am源的α粒子进行的实验得到了独立验证。所描述的方法有望对激光等离子体中的核反应研究有用。
