通过超强激光与等离子体相互作用对快氘核产生的中子能谱的观测。
Observation of neutron spectrum produced by fast deuterons via ultraintense laser plasma interactions.
作者信息
Izumi N, Sentoku Y, Habara H, Takahashi K, Ohtani F, Sonomoto T, Kodama R, Norimatsu T, Fujita H, Kitagawa Y, Mima K, Tanaka K A, Yamanaka T
机构信息
Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871, Japan.
出版信息
Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Mar;65(3 Pt 2B):036413. doi: 10.1103/PhysRevE.65.036413. Epub 2002 Mar 6.
We report the first precise spectral measurement of fast neutrons produced in a deuterated plastic target irradiated by an ultraintense sub-picosecond laser pulse. The 500-fs, 50-J, 1054-nm laser pulse was focused on the deuterated polystyrene target with an intensity of 2 x 10(19) W/cm(2). The neutron spectra were observed at 55 degrees and 90 degrees to the rear target normal. The neutron emission was 7 x 10(4) per steradian for each detector. The observed neutron spectra prove the acceleration of deuterons and neutron production by d(d,n)3He reactions in the target. The neutron spectra were compared with Monte Carlo simulation results and the deuteron's directional anisotropy and energy spectrum were studied. We conclude that 2% of the laser energy was converted to deuterons, which has an energy range of 30 keV up to 3 MeV.
我们报告了对超强亚皮秒激光脉冲辐照含氘塑料靶产生的快中子的首次精确光谱测量。500飞秒、50焦、1054纳米的激光脉冲聚焦在含氘聚苯乙烯靶上，强度为2×10¹⁹瓦/平方厘米。在与靶后法线成55度和90度的方向观测中子能谱。每个探测器测得的中子发射率为每球面度7×10⁴。观测到的中子能谱证明了靶中氘核的加速以及通过d(d,n)3He反应产生中子。将中子能谱与蒙特卡罗模拟结果进行了比较，并研究了氘核的方向各向异性和能谱。我们得出结论，2%的激光能量转化为了能量范围在30千电子伏至3兆电子伏的氘核。
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