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在俄罗斯杜布纳联合核子研究所新建高能重离子加速器NUCLOTRON上用0.65～1.0 GeV质子轰击厚Pb靶,对靶区的中子参数进行了研究。使用的比靶的厚度为20cm,直径8cm,呈圆柱状。Pb靶的外围用6cm厚石腊作慢化体。质子沿比靶轴线入射,模拟加速器驱动次临界反应堆（洁净核能系统）的堆芯结构和核反应过程。在Pb靶表面和慢化体表面放置1mm厚CR-39固体径迹探测器薄片作为中子探测器,入射的质子数目为1.55×1013（0.65GeV）、0.84×1013（1.0 GeV）和1.22×1013（1.5 GeV）,用70℃ 6.5mol/L NaOH蚀刻CR-39中的
The neutron parameters in the target zone were studied by bombarding the thick Pb target with proton at 0.65 ~ 1.0 GeV at the new high energy heavy ion accelerator NUCLOTRON at Dubna Institute of Nuclear Physics in Russia. The specific target thickness of 20cm, diameter 8cm, cylindrical. The periphery of the Pb target was modeled with 6 cm thick paraffin wax. The protons incident along the target axis simulate the core structure and nuclear reaction processes of accelerator-driven subcritical reactors (clean nuclear energy systems). A 1 mm thick CR-39 solid track detector sheet was placed on the surface of the Pb target and on the surface of the moderator as neutron detectors. The number of protons incident was 1.55 × 1013 (0.65GeV), 0.84 × 1013 (1.0 GeV) and 1.22 × 1013 (1.5 GeV) and etching CR-39 with 70% 6.5 mol / L NaOH