由激光加速的硼离子引发的H-11B聚变产生α粒子
Alpha-particle generation from H-11B fusion initiated by laser-accelerated boron ions
AI总结：
本文报道利用飞秒激光加速硼离子轰击含氢靶引发H-11B聚变产生MeV α粒子，为超短MeV α粒子源提供新途径，并为离子阻止本领和反应截面研究提供参考方案。
摘要：
本文报道了由激光加速硼离子引发的H-11B聚变产生MeV α粒子。利用强度为10^19W/cm^2的1J飞秒脉冲辐照60 nm厚的自支撑硼纳米箔，产生了最大能量为6MeV、在5MeV处通量为10^9/MeV/sr的硼离子。通过用硼离子轰击次级含氢靶，记录到3*10^5/sr来自H-11B聚变的α粒子，这与根据测得的硼能谱计算的理论产额一致。结果表明，利用紧凑飞秒激光产生超短MeV α粒子源的一种新途径。该离子加速和产物测量方案可为固体或等离子体中离子阻止本领及H-11B反应截面的研究提供参考。
英文摘要：
Here we report the generation of MeV alpha-particles from H-11B fusion initiated by laser-accelerated boron ions. Boron ions with maximum energy of 6MeV and fluence of 10^9/MeV/sr@5MeV were generated from 60-nm-thick self-supporting boron nanofoils irradiated by 1J femtosecond pulses at an intensity of 10^19W/cm^2. By bombarding secondary hydrogenous targets with the boron ions, 3*10^5/sr alpha-particles from H-11B fusion were registered, which is consistent with the theoretical yield calculated from the measured boron energy spectra. Our results demonstrate an alternative way toward ultrashort MeV alpha-particle sources employing compact femtosecond lasers. The ion acceleration and product measurement scheme are referential for the studies on the ion stopping power and cross-section of the H-11B reaction in solid or plasma.
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